Choke shotgun markings

The constriction of a Benelli choke tube can be determined by the markings or notches on the end, which indicate its level of tightness. Can I use lead shot with all types of Benelli choke tubes? Most Benelli choke tubes are suitable for use with lead shot, but it’s important to verify this information with the specific choke tube in question.

1646 posts · Joined 2015. #6 · May 16, 2022. Choke dimensions are visible on the right barrel 18.5 mm is the finished bore diameter, 18.1 mm is the choke - approximately .004 inch per 0.1 mm difference. Right Choke is 0.016 inch or light modified. Dimension 18.3 is the bore diameter at first viewing. Like.Jan 3, 2019 ... One of the annoying things about shotguns is that they often don't shoot the way they are marked. This is particularly true of older guns that ...Basics. The basics of what choke tubes are and how they are used. What is a choke tube? How a choke tube works. Choke tube patterns. Choke Systems. Common choke systems installed on popular shotguns. Each page lists choke sizes, compatible shotguns, and choke tubes that fit the respective choke system. Benelli/Beretta Mobil. Crio Plus.Choke sizesare classified by both their measurement (to a thousandth of an inch) and by a special naming system. Choke measurements range from open chokes of around 0.725″ to 0.770″, to more restrictive chokes of around 0.600″ to 0.680″.Browning BSS 20ga chote markings. I have a 20 ga 26" tubes,fixed chokes, where are the choke markings on the barrel. I am use to the old system of stars and dashes. This is a BSS and the only thing I see under the forearm is a 3 on one barrel and a 5 on the other. Any help would be appreciated.14040 posts · Joined 2009. #3 · Feb 22, 2010. When I figured out the markings, I wrapped the end of each extended tape with masking tape and wrote on the tape with a magic marker the choke size. Works for me, and I don't have to wear my reading glasses in the field. "We pulled the trigger, the safety went forward, both barrels fired almost ...Optima-Choke choke tubes will be marked Optima-Choke. The start of the threaded portion of the Optima-Choke tube is located a nominal 50.78 mm (2.00 inch) from the breech end of the choke tube. The length of the threaded portion is a nominal 15.9 mm (.625 inch). The major diameter of the choke tube thread is 20 mm (.787 inch).Factory Choke Identification Codes. AMERICAN TACTICAL IMPORTS. BERETTA. BENELLI/FRANCHI/STOEGER. REMINGTON SPARTAN (SPR) NOTCH CODES. BROWNING …

I've put them into this ordered list so you can see where they fit into the size ranges: Cylinder (no choke) Skeet 1: Specialty choke for skeet shooting, a form of moving (clay) targets for shotguns. Constriction is 0.13mm/0.005in. barrel to muzzle, and patterns 45% at 40 yards, 75% at 25 yards.It has a modified choke, but like all .410's it throws a truly lousy pattern no matter what choke is used. To twenty five yards, a .410 will work. Twenty yards is much, much better. Anything much over thirty yards and a .410 will spray it's pellets all over the place. A .410 is really not a beginnner's gun.Choke markings; 15.7 is the metric bore size. The 15.3 and 15.1 are the muzzle measurements. 15.7 divided by 254=.618 which is very close to normal bore size for a 20. 15.3 divided by 254=602: difference of .015=mod. choke. 15.1 divided by 254=.594: difference to bore; .024=full choke. over the hill and picking up speed.A shotgun barrel’s choke will be located at the muzzle end of the barrel and you will encounter them in two different designs. The oldest way is called a “fixed choke.”. Many side-by-side and older single barrels will have fixed chokes, meaning that their barrels have the choke constriction built-in to the end of the barrel at the muzzle end.Rizzini USA would be able to help as well. I got it figured out. Briley's site had pics and measurements for the different Rizzini choke styles. The 28 gauge on the left is a Rizzini choke, the the 20 gauge in the middle and the 12 gauge on the right are both Rizzini plus chokes. The 20 gauge has different measurements to the threads than the ...Hopkins & Allen Manufacturing Co. was in business 1868-1898 and produced falling block single barrel shotguns. The enterprise became Hopkins & Allen Arms Co. 1898-1914 and introduced "tip-up" single barrel shotguns in 1902 after acquiring Forehand Arms; with a distinctive barrel take down lever and drop point receiver.Most double shotguns represented here. Double gun shotguns - Side by Side shotguns, and over under shotguns - Including drillings, double barreled rifles, SxS double rifles, combination guns. Makers - Darne, Merkel, Arrieta, Beretta, Browning, Holland, Purdey, Richards, Bernardelli, Parker, Fox, LC Smith, and most other double …A Benelli choke tube with 3 lines (III) is a modified choke. Beretta shotguns that use Mobil chokes will also show 3 lines to indicate modified. Browning choke tube markings are slightly different, and 3 lines means Improved Cylinder Lead or Modified Steel. The line markings on a choke tube can be found etched into the top edge of the …

125 posts · Joined 2006. #6 · Sep 4, 2007. Hello. Choke on the fixed-choke guns by Boito is usually marked on the underside of the monobloc or barrels. Take the forearm off and remove the barrels. You should be able to see asterisks marked on the underside. FWIW: * = full. ** = imp. mod.Shotgun choke markings can be identified using 5 simple methods. They include referencing a sizing chart to find the correct choke, counting the lines or notches, observing dots or circles on the choke, locating writing on the side wall, and using bore sizing tools to measure the diameter.Rizzini USA would be able to help as well. I got it figured out. Briley's site had pics and measurements for the different Rizzini choke styles. The 28 gauge on the left is a Rizzini choke, the the 20 gauge in the middle and the 12 gauge on the right are both Rizzini plus chokes. The 20 gauge has different measurements to the threads than the ...I'm trying to settle an argument between a buddy and I he indicated all the new Browning Gold shotguns have the Invector Plus choke tubes, I have a new Classic Hunter and the tubes look like the standard Invector choke tubes not the Invector Plus. ... In the older Superposed, actual Skeet guns with larger skeet forends seem to have little ...

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Location: Northwest PA. I know that Ithaca flues were marked as follows. '0' is cylinder bore. '1' is improved cylinder. '2' is modified. '3' is improved modified. '4' is full choke." One of my barrels is definitely a 4 (Full). I'm not certain of the other.When you open the gun, turn it sideways and there should be marks where the barrels go into the receiver. The marks should be something to the extent of *- or something like that. There is a thread at the top of this forum about Browning choke codes. Good luck! Open the gun and look on the left side of the Mono Block.Member Member Joined: 26 Apr 2005. Posts: 743 ; Woodcock, your chart comes out of Jack O'Connor's "Shotgun Book".j the answer to your question is in the third photo. The right choke has 2 notches cut into it and the left choke has 3 notches. According to Stoeger's website the right choke is an IM or Improved Modified and the left choke is a Mod of Modified choke. Here is a link to their website with the answers you're looking for.If we have multi choked your gun, the chokes will have laser/etched markings showing the gun make and the numbers in the gun serial number. For example; a Miroku with serial no. 77205NP would be marked with M.77205 CloseThe diameter table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels of a specific make and type, as well as 12-gauge choke sizes in inches, 10-gauge, 20-gauge, 16-gauge, 28-gaug e, and .410 shotguns. The most popular choke systems are shown, which include Standard …

Choke tubes control the dispersion of shot inside the shotshell. Without a choke tube added to the barrel's end, there would be no way to control the barrel's payload. The payload is the shot coming down the barrel, and that shot is concealed in a wad. If your shotgun barrel is threaded for chokes, don't ever fire the shotgun without placing a ...933 posts · Joined 2012. #20 · Jul 29, 2016. Some trivia collector minutia - The choke words were stamped on the barrels prior to 1929. The transition from the barrel address from Ogden to St Louis began in 1929 and completed in 1930.14040 posts · Joined 2009. #3 · Feb 22, 2010. When I figured out the markings, I wrapped the end of each extended tape with masking tape and wrote on the tape with a magic marker the choke size. Works for me, and I don't have to wear my reading glasses in the field. "We pulled the trigger, the safety went forward, both barrels fired almost ...Mar 6, 2011 ... Below is a chart that shows the common markings on a shotgun choke tube. The tightest choke being at the top, Full. Choke Designation ...We would like to show you a description here but the site won’t allow us.February 17, 2024 by Wayne Fletcher. Mossberg choke tubes are identifiable by their unique color-coded bands on the tube end. Each color signifies a different choke constriction, which determines the spread and pattern of the shot. The wide range of colors makes it easier for shooters to select the right choke for their needs.No sense in wasting time patterning chokes that duplicate each other, unless there is some secret meaning to these markings. Save Share. Like. RWH24. ... The front AND rear inside diameter of the tube are identical to the normal Full choke tube that also came with the gun. 3. The tube is a proper fit in the threads of the 26" LC barrel, …Hello, i came to this forum to get some help determining the type of chokes on my shotgun, its a Acciao Breda B4 oxu, old shotgun, the markings on my Left (upper) barrel is 18.4 and on the Right (lower) is 18.3, im pretty lost on how to calculate the choke type, if anyone could help me know more about my shotgun not only choke type …

May 18, 2019 ... ... choke and shot shell might be a little confusing. In this episode of Backcountry College, Clay Hayes explains how different shotgun chokes ...

Ol Timer. 9395 posts · Joined 1999. #2 · Mar 6, 2011. Those markings are proof marks and the gauge and chamber size. 16 gauge - 2 3/4" chamber. Measure the barrels with calibers to find out what choke it has. Start with .662" and subract the following in inch scale. 000 restriction - cylinder. .005 restriction - skeet.Feb 18, 2010 · 14040 posts · Joined 2009. #3 · Feb 22, 2010. When I figured out the markings, I wrapped the end of each extended tape with masking tape and wrote on the tape with a magic marker the choke size. Works for me, and I don't have to wear my reading glasses in the field. "We pulled the trigger, the safety went forward, both barrels fired almost ... These choke diagrams compare similar choke systems for different brands and highlight key features in order to identify which choke you have. Choke design, thread location, thread count, and other key identifying features are all listed to make for rapid identification. Standard Invector vs Invector Plus. Invector Plus vs Invector DS. Yildiz shotguns typically use Beretta/Benelli Mobil style choke tubes, making it easier to find compatible chokes for your gun. Contents [ show] 1. Can I use other brands’ choke tubes in a Yildiz shotgun? Yes, as long as they are Beretta/Benelli Mobil style, they should be compatible with Yildiz shotguns. 2.Choking Dreams Interpreted Choking is a common dream. What could it mean? In general, dreaming about choking represents something that’s blocking you in your everyday life. Subcons...That is what the old Charles Daly I used to have was marked and that is what it was. You lie to the Government, it's a Felony, they lie to you, it's Politics! You are right. I have a Daly Miroku and it was choked Imp Mod (+-) and Mod (++) before Mike Orlen added tubes. I suspect that ++- is light modified.8968 posts · Joined 2005. #1 · Mar 28, 2006. Beretta currently uses (or recently has used) 3 different choke tube types on different models of shotguns. They can be identified by the image below. Note that all the tubes pictured here are flush tubes. There are several styles of extended tubes with different styles of extension, but the part ...1108 posts · Joined 2005. #11 · Jul 4, 2007. Fastarget is correct. Merkel chokes tend to run tight. My 1620 is marked VBZ/1/2 (IC/Mod), but the chokes patterned more like Mod/Improved Mod. I opened the IC barrel to skeet and the left barrel remains a tight Mod. It makes for a pretty versatile gun. To do this, you need a large piece of paper or cardboard placed at 40 yards. Draw a central aiming point and shoot at it from that distance. Find the center of the pattern on the target and draw a 30 inch circle. I do this by attaching a 15” string to a sharpie and holding the other end in the center of the pattern.

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The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels for Blaser 12-gauge shotguns compared to common fixed choke shotgun gauges. Knowing the diameter of a choke tube is important in order to identify choke tube constriction. The tighter the choke tube, the more …That is what the old Charles Daly I used to have was marked and that is what it was. You lie to the Government, it's a Felony, they lie to you, it's Politics! You are right. I have a Daly Miroku and it was choked Imp Mod (+-) and Mod (++) before Mike Orlen added tubes. I suspect that ++- is light modified.Muller is a choke tube manufacturer that designs premium choke tubes for waterfowl hunting. All choke tubes are made in the USA. Muller offers shotgun chokes in .410 bore, 20 gauge, and 12 gauge. Muller offers a wide range of choke tubes designed for competition shooting as well as waterfowl hunting.Nov 11, 2003 · S. soreshoulder. 328 posts · Joined 2003. #2 · Nov 11, 2003. My Fox Model B had neither choke markings or a serial number, for that matter. Your gun is probably choked Modified-Full, although it could be Improved Cylinder-Modified. Take it to a smith...he'll have the gauges to make the determination. 1646 posts · Joined 2015. #6 · May 16, 2022. Choke dimensions are visible on the right barrel 18.5 mm is the finished bore diameter, 18.1 mm is the choke - approximately .004 inch per 0.1 mm difference. Right Choke is 0.016 inch or light modified. Dimension 18.3 is the bore diameter at first viewing. Like.That is what the old Charles Daly I used to have was marked and that is what it was. You lie to the Government, it's a Felony, they lie to you, it's Politics! You are right. I have a Daly Miroku and it was choked Imp Mod (+-) and Mod (++) before Mike Orlen added tubes. I suspect that ++- is light modified.Jul 1, 2015 · Identification (Notches, Stars, Alpha Code, or Color Band) Full Choke: I notch, or * star. Improved Modified: II notches, or ** stars. Modified: III notches, or *** stars. Improved Cylinder: IIII notches, or **** stars. Jul 22, 2023 ... Perazzi Fixed Choke Barrel Markings ... I downloaded this Perazzi chart and some of it makes no sense to me. ... full and extra full. Doesn't make ...8968 posts · Joined 2005. #1 · Mar 28, 2006. Beretta currently uses (or recently has used) 3 different choke tube types on different models of shotguns. They can be identified by the image below. Note that all the tubes pictured here are flush tubes. There are several styles of extended tubes with different styles of extension, but the part ...ATA shotguns typically use interchangeable chokes with varying degrees of constriction to effectively control the spread of the shot pattern. These chokes include but are not limited to full, improved modified, modified, improved cylinder, and cylinder. Contents [ show]The chokes had me confused with their markings. Cylinder choke says "IC on 18.6 Overbored Barrels". All chokes are marked as .010" tighter on overbored barrels. ... Rizzini made a change to newer Rizzini Plus chokes in that gun and a .735 bore. 3. Put the gun on paper and see what you have. I had one size tighter, even with Trulock.Antique porcelain is highly sought after by collectors and enthusiasts around the world. One of the key factors in determining the value and authenticity of an antique porcelain pi... ….

When you open the gun, turn it sideways and there should be marks where the barrels go into the receiver. The marks should be something to the extent of *- or something like that. There is a thread at the top of this forum about Browning choke codes. Good luck! Open the gun and look on the left side of the Mono Block.I am a bit confused about Krieghoff choke markings. I am assuming that the "1" and "3" on my field choked Krieghoffs are improved cylinder and improved modified, but I'm not sure. ... A forum community dedicated to Shotgun owners and enthusiasts including the Remington, Beretta, and Mossberg shotguns brands. Come join the discussion …Most double shotguns represented here. Double gun shotguns - Side by Side shotguns, and over under shotguns - Including drillings, double barreled rifles, SxS double rifles, combination guns. Makers - Darne, Merkel, Arrieta, Beretta, Browning, Holland, Purdey, Richards, Bernardelli, Parker, Fox, LC Smith, and most other double barreled shotgun, …Purchasing a shotgun in California does not require any special license or permit in most cases. The person purchasing the gun must be at least 18 years of age and not have a felon...Patterns are shot with 2 3/4" ammunition in 3" chambers. The following average pattern percentages are expected in Browning barrels when shot with lead ammunition at 40 yards: DESCRIPTION. PATTERN PERCENTAGE. INVECTOR-DS CHOKE, 12, FULL. 75-80%. INVECTOR-DS CHOKE, 12, LIGHT FULL. 70-75%. INVECTOR-DS CHOKE, 12, …Weeds can be a nuisance in any garden or lawn. They can quickly take over and choke out other plants, making it difficult to keep your garden looking its best. Fortunately, there a...6534 posts · Joined 2013. #9 · Jan 5, 2021. And just to note, before someone states the above specs are SAAMI and "do not apply" to a gun manufactured in either Belgium or Japan, where CIP reigns, the CIP specs for a 12-gauge barrel are 18.2mm+0.7mm, so 18.2-18.9mm. Which, math says are 0.71653" to 0.7440944".Most double shotguns represented here. Double gun shotguns - Side by Side shotguns, and over under shotguns - Including drillings, double barreled rifles, SxS double rifles, combination guns. Makers - Darne, Merkel, Arrieta, Beretta, Browning, Holland, Purdey, Richards, Bernardelli, Parker, Fox, LC Smith, and most other double barreled shotgun, …If you work in the field of surveying or construction, you may have come across the term “bench mark elevation correction.” This process is crucial to ensure accurate measurements ... Choke shotgun markings, Sep 14, 2023 ... Perazzi shotgun choke markings are as follows the KG xxxx is the gram weight of the barrels the 18.4 being .724", 18.5 being .729" is the ..., The choke constricts the shot pattern, giving shooters the ability to customize their spread for different shooting scenarios. FAQs About Shotgun Chokes: 1. What is a shotgun choke? A shotgun choke is a device that narrows or constricts the bore at the muzzle, affecting the spread of the shot pattern., How to identify the right Choke Tube for your gun: Identification Methods. 1) Visual Method. 2) Choke Measurement Method. 3) Barrel Markings Method. 4) Serial Number Method. Choke Tube Constrictions chart. How can I identify which screw in choke tubes I should use in my Beretta shotgun: Mobilechoke, Optima-Choke, Optima-Choke Plus, or Optima ..., 6534 posts · Joined 2013. #9 · Jan 5, 2021. And just to note, before someone states the above specs are SAAMI and "do not apply" to a gun manufactured in either Belgium or Japan, where CIP reigns, the CIP specs for a 12-gauge barrel are 18.2mm+0.7mm, so 18.2-18.9mm. Which, math says are 0.71653" to 0.7440944"., Understanding the Notch System. The notch system used can vary between manufacturers, but most commonly, a single notch indicates a full choke, suitable for long-range shots with a tight shot pattern. Two notches typically represent an improved modified, providing a slightly wider pattern., In today’s fast-paced digital world, live streaming has become a popular and effective way for individuals and businesses to connect with their audience in real-time. One such live..., However, it’s best to pattern your shotgun with different chokes to determine which one works best for your specific hunting situation. 5. Can I shoot steel shot through my Stoeger choke tubes? ... Stoeger choke tubes often feature markings on the side or notches on the top rim that indicate the choke constriction, making it easy to …, Muller is a choke tube manufacturer that designs premium choke tubes for waterfowl hunting. All choke tubes are made in the USA. Muller offers shotgun chokes in .410 bore, 20 gauge, and 12 gauge. Muller offers a wide range of choke tubes designed for competition shooting as well as waterfowl hunting., Jan 3, 2019 ... One of the annoying things about shotguns is that they often don't shoot the way they are marked. This is particularly true of older guns that ..., Most double shotguns represented here. Double gun shotguns - Side by Side shotguns, and over under shotguns - Including drillings, double barreled rifles, SxS double rifles, combination guns. Makers - Darne, Merkel, Arrieta, Beretta, Browning, Holland, Purdey, Richards, Bernardelli, Parker, Fox, LC Smith, and most other double …, The only stampings under the barrels I can see that might indicate choke are, **- on the right barrel & ** on the left. Those are the choke markings. The right barrel is the most open, just one increment less tight than the left. Not sure, but likely modified and IC. Full, I believe was 3 *'s and the - means one increment less., Choke markings; 15.7 is the metric bore size. The 15.3 and 15.1 are the muzzle measurements. 15.7 divided by 254=.618 which is very close to normal bore size for a 20. 15.3 divided by 254=602: difference of .015=mod. choke. 15.1 divided by 254=.594: difference to bore; .024=full choke. over the hill and picking up speed., Vintage Shotgun Choke Markings. Unlike most manufacturers, Savage chose not to mark their shotgun barrels with standard choke markings of Full, Modified, Improved Cylinder and Cylinder. Instead they chose to use a series of asterisk (*) marks as code to specify the choke constriction of a given barrel. This code can be found stamped on the ..., No sense in wasting time patterning chokes that duplicate each other, unless there is some secret meaning to these markings. Save Share. Like. RWH24. ... The front AND rear inside diameter of the tube are identical to the normal Full choke tube that also came with the gun. 3. The tube is a proper fit in the threads of the 26" LC barrel, …, Mar 6, 2011 ... Those markings are proof marks and the gauge and chamber size. 16 gauge - 2 3/4" chamber. Measure the barrels with calibers to find out what ..., Dec 3, 2016 · Improved cylinder: Offers a constriction of 0.010 inch, and is used to get a nice pattern up to about 30 yards. Like the aforementioned cylinder choke, it is also a popular choice with skeet, trap, and clay shooters. Modified: This choke provides a constriction of 0.020 inch, and is effective up to about 45 yards. , The choke tube table above shows the diameters and constrictions you can expect for choke tubes and shotgun barrels for Benelli 12-gauge and 20-gauge shotguns featuring the Crio, Crio Plus, and Mobil choke systems.Knowing the diameter of a choke tube is important in order to identify choke tube constriction. The tighter the choke tube, …, May 6, 2012 ... There are generally five choke types that people use in their shotguns: full, improved modified, modified, imp cylinder and cylinder. The ..., Hello, i came to this forum to get some help determining the type of chokes on my shotgun, its a Acciao Breda B4 oxu, old shotgun, the markings on my Left (upper) barrel is 18.4 and on the Right (lower) is 18.3, im pretty lost on how to calculate the choke type, if anyone could help me know more about my shotgun not only choke type if full, improved cylinder, modified, etc., 1. Visual Method. The fastest way to identify the “Family” is to take down one choke you are currently using on your shotgun, clean it and cheek the markings on the side of the choke, here an example: In the example image, you see an Optima-Choke HP Choke. Note: Mobile-Choke “Family” could also be marked as “PB” or “ST”., Dec 9, 2023 · Understanding the Notch System. The notch system used can vary between manufacturers, but most commonly, a single notch indicates a full choke, suitable for long-range shots with a tight shot pattern. Two notches typically represent an improved modified, providing a slightly wider pattern. , The tighter the choke the heavier the radial forces, the tighter the pellets are squeezed together so the pattern holds tighter over a longer distance. Conversely, the less restriction you have in the shotgun choke the more loosely the pellets are held together and the faster the pattern opens up. There you have it! , A “Cylinder Choke” will provide the best accuracy. Any choke with constriction of .020″ or more can result in damage to the barrel. Our “Improved Choke” tubes have a constriction of .013″ and therefore may be used with rifled slugs; however, accuracy may be compromised. Weatherby recommends slugs only be fired using a non-ported ... , The choke constricts the shot pattern, giving shooters the ability to customize their spread for different shooting scenarios. FAQs About Shotgun Chokes: 1. What is a shotgun choke? A shotgun choke is a device that narrows or constricts the bore at the muzzle, affecting the spread of the shot pattern., The choke tube table above shows the diameters and constrictionsyou can expect for choke tubes and shotgun barrels for SKB 12-gaugeshotguns compared to common fixed choke shotgun gauges. Knowing the diameter of a choke tube is important in order to identify choketube constriction. The tighter the choke tube, the more constriction it has and the ..., A choke tube wrench can be used to identify Stoeger chokes by removing the choke tube and inspecting the markings on the tube itself. 10. Do all Stoeger shotguns come with choke tubes? Some Stoeger shotguns come with choke tubes included, while others may require the purchase of compatible choke tubes separately. 11., Aug 7, 2008 · The chokes in an L.C. Smith run parrallel for 1" and then taper 1 9/16" to bore size of .729-.732 in 12 ga. Also your gun was made in 1908, and after 1913 the 0 grade became Ideal Grade. The markings on the barrels are probably the barrel makers mark as the 0 grade had London Steel barrels or Damascus steel, I think Chain Damascus. , Jul 13, 2015 ... Benelli Tech Shop Benelli shotguns come equipped with up to five choke tubes, and changing them out is a breeze! In this video, learn how to ..., May 18, 2019 ... ... choke and shot shell might be a little confusing. In this episode of Backcountry College, Clay Hayes explains how different shotgun chokes ..., To easily identify Beretta choke tubes, look for the distinctive “PB” or “Steel Proof” markings on the tubes. These markings indicate that the choke tubes are manufactured by Beretta. See 3,000+ New Gun Deals HERE., Choke markings; 15.7 is the metric bore size. The 15.3 and 15.1 are the muzzle measurements. 15.7 divided by 254=.618 which is very close to normal bore size for a 20. 15.3 divided by 254=602: difference of .015=mod. choke. 15.1 divided by 254=.594: difference to bore; .024=full choke. over the hill and picking up speed., That is what the old Charles Daly I used to have was marked and that is what it was. You lie to the Government, it's a Felony, they lie to you, it's Politics! You are right. I have a Daly Miroku and it was choked Imp Mod (+-) and Mod (++) before Mike Orlen added tubes. I suspect that ++- is light modified., I have recently obtained an older used CZ BRNO 12 gauge o/u ejector SG, MOD 501.2 manufactured around 1987-8. I’m trying to decipher the choke markings stamped on the base of the barrels. They are 17,4 ( top barrel) and 17,8 on the bottom. Could anyone please tell me how these equate to either UK choke markings, ie, Open, …