bicykillgaz Posted June 5, 2012 Report Share Posted June 5, 2012 Hi gents, I've just got a new o/u 20b and stuck 1/2 &1/4 in it but then I got out in the woods alone to test it and got thinking, im using 28g 6s through the 20b with 1/4 & 1/2 but if I was using a 12g 28g load I'd probably use 1/4 & 1/2 which means the 20b is chucking the same amount of lead in a lot tighter pattern. It got me wondering if when people go from 12 to 20 do you open your chokes up to 1/4 & cyl or go with the tighter pattern? Atb Gary Quote Link to comment Share on other sites More sharing options...
wymberley Posted June 5, 2012 Report Share Posted June 5, 2012 No matter what bore, the spread for any given degree of choke remains the same. Quote Link to comment Share on other sites More sharing options...
stu nesling Posted June 5, 2012 Report Share Posted June 5, 2012 only diff is a longer shot string on the 20, due to the length of the column of shot. leave em at 1/4 + 1/2 mate you cant go wrong unless they are very long birds. Quote Link to comment Share on other sites More sharing options...
bicykillgaz Posted June 5, 2012 Author Report Share Posted June 5, 2012 (edited) No matter what bore, the spread for any given degree of choke remains the same. So with a 20 and 12 at 25, 30 and 40 yards the patterns are the same size? I understand that the angles which the shot exits the barrel witll be the same but surely the pattern sizes differ? I thought you had a larger killzone with a 12 than a 20 Edited June 5, 2012 by bicykillgaz Quote Link to comment Share on other sites More sharing options...
Paul T Posted June 5, 2012 Report Share Posted June 5, 2012 No matter what bore, the spread for any given degree of choke remains the same. I've pondered this for a while but also assumed a smaller diameter (20b) would give a tighter pattern than a larger diameter (12b). So basically shooting a 20b with cylinder would be like a 12b with full (perhaps) ? I'd love to get my head round the physics so a more in-depth explanation would be appreciated Quote Link to comment Share on other sites More sharing options...
bicykillgaz Posted June 5, 2012 Author Report Share Posted June 5, 2012 only diff is a longer shot string on the 20, due to the length of the column of shot. leave em at 1/4 + 1/2 mate you cant go wrong unless they are very long birds. Seemed to work well enough on the squirrel I bagged I've pondered this for a while but also assumed a smaller diameter (20b) would give a tighter pattern than a larger diameter (12b). So basically shooting a 20b with cylinder would be like a 12b with full (perhaps) ? I'd love to get my head round the physics so a more in-depth explanation would be appreciated That's what I though only you wrote it better Quote Link to comment Share on other sites More sharing options...
utectok Posted June 5, 2012 Report Share Posted June 5, 2012 No matter what bore, the spread for any given degree of choke remains the same. Never understood why but it's true stick with 1/4 &1/2 though it might not pattern the same it'll be similar to the 12 Quote Link to comment Share on other sites More sharing options...
utectok Posted June 5, 2012 Report Share Posted June 5, 2012 A .410 also spreads the same strange eh! The old timer I knew said that you have to choke 20 bores more utter rot! Quote Link to comment Share on other sites More sharing options...
stu nesling Posted June 5, 2012 Report Share Posted June 5, 2012 (edited) probably impossible to tell in real life what the difference is. choke , i think is only a measure of constriction in the end of the barrel. and given that one shell type/brand will pattern different to another type/brand, the only solution is to get in the woods with some paper and give it a go gary. Percentage Of Shot Inside 30″ Circle CHOKE 20 Yds 30 Yds 40 yds Cylinder 80% 60% 40% Skeet 92% 72% 50% Improved Cylinder 100% 77% 55% Modified 100% 83% 60% Improved Modified 100% 91% 65% Full 100% 100% 70% use these charts to work out what you are actually getting from a particular shell/choke combination. SHOT SIZE LEAD/ STEEL 8 585 - – - 7 1/2 410 - – - 6 225 316 5 170 243 4 135 191 count per ounce of shot. good luck counting all those little holes stu Edited June 5, 2012 by stu nesling Quote Link to comment Share on other sites More sharing options...
bicykillgaz Posted June 5, 2012 Author Report Share Posted June 5, 2012 probably impossible to tell in real life what the difference is. choke , i think is only a measure of constriction in the end of the barrel. and given that one shell type/brand will pattern different to another type/brand, the only solution is to get in the woods with some paper and give it a go gary. Percentage Of Shot Inside 30″ Circle CHOKE 20 Yds 30 Yds 40 yds Cylinder 80% 60% 40% Skeet 92% 72% 50% Improved Cylinder 100% 77% 55% Modified 100% 83% 60% Improved Modified 100% 91% 65% Full 100% 100% 70% use these charts to work out what you are actually getting from a particular shell/choke combination. SHOT SIZE LEAD/ STEEL 8 585 - – - 7 1/2 410 - – - 6 225 316 5 170 243 4 135 191 count per ounce of shot. good luck counting all those little holes stu I think I'll take yours and wymberleys word for it, is that shot percentage/distance chart generic for all gauges then? Quote Link to comment Share on other sites More sharing options...
stu nesling Posted June 5, 2012 Report Share Posted June 5, 2012 (edited) as far as i know, yes. as it uses the pellet count in the circle divided by the number of pellets in the shell x 100to give you the %. its a fixed equation that can be applied to any bore. dont look into it too deeply gaz, if the squizzers die, its right. stu Edited June 5, 2012 by stu nesling Quote Link to comment Share on other sites More sharing options...
bicykillgaz Posted June 5, 2012 Author Report Share Posted June 5, 2012 as far as i know, yes. as it uses the pellet count in the circle divided by the number of pellets in the shell x 100to give you the %. its a fixed equation that can be applied to any bore. dont look into it too deeply gaz, if the squizzers die, its right. stu It was quiet not much about and my mind started wondering, I just assumed smaller barrel meant smaller kill zone so if it was the same load it would just be a more dense tighter pattern. The squirrel definitely died shame I wasn't quick enough to get his mate on the branch above too. Quote Link to comment Share on other sites More sharing options...
Underdog Posted June 5, 2012 Report Share Posted June 5, 2012 My remmy 870 came with a 1/2 choke tube. I dismissed it and ordered a 1/4 .I recently put the 1/2 back in and seemed to d better with it! I am now thinking all I may of done is use the chokes to suit the shell. I am of the notion it can be foolish to trust a chart. Only a test will satisfy. U. Quote Link to comment Share on other sites More sharing options...
wymberley Posted June 5, 2012 Report Share Posted June 5, 2012 There's always confusion about this just as there's a train of thought that thinks the effective range of, say, a 410 is less than, say, a 12 bore because the velocity of similar sized pellets is less in the smaller bore. Choke is a performance, not a measurement. The measurements of the physical restrictions in the barrel vary with each bore and are designed to give the one range/pattern spread with which we are all familiar. PS The lead pellet sizes given on this thread are not British. Quote Link to comment Share on other sites More sharing options...
Oops Missed Again Posted June 5, 2012 Report Share Posted June 5, 2012 Choke is a performance, not a measurement. The measurements of the physical restrictions in the barrel vary with each bore and are designed to give the one range/pattern spread with which we are all familiar. Choke is a measurement, but also a term which instigates confusion. No mater what choke, skeet or extra full if you are on the target with the correct size and load of pellet, it's a hit. Try pattern testing for real and not with percentages etc and you will have a surprise or two. Quote Link to comment Share on other sites More sharing options...
hawkfanz Posted June 6, 2012 Report Share Posted June 6, 2012 Hi gents, I've just got a new o/u 20b and stuck 1/2 &1/4 in it but then I got out in the woods alone to test it and got thinking, im using 28g 6s through the 20b with 1/4 & 1/2 but if I was using a 12g 28g load I'd probably use 1/4 & 1/2 which means the 20b is chucking the same amount of lead in a lot tighter pattern. It got me wondering if when people go from 12 to 20 do you open your chokes up to 1/4 & cyl or go with the tighter pattern? Atb Gary hello i use a browning 20g an i always use cyl an 1/4 or 1/2 for pigeon decoyin an pheasant an inland duck shooting.i use 28gram felt wad 6,s and for duck 24gram steel.an its my favorite set up,better than my browning 12,an my beretta 12s/a cos its so light an pointable an easy to carry all day.regards an good hunting.john. Quote Link to comment Share on other sites More sharing options...
wymberley Posted June 6, 2012 Report Share Posted June 6, 2012 Choke is a performance, not a measurement. The measurements of the physical restrictions in the barrel vary with each bore and are designed to give the one range/pattern spread with which we are all familiar. Choke is a measurement, but also a term which instigates confusion. No mater what choke, skeet or extra full if you are on the target with the correct size and load of pellet, it's a hit. Try pattern testing for real and not with percentages etc and you will have a surprise or two. I've pattern tested a few in my time. The OP was shooting live quarry and by the sound of you shoot clays. For you it may well be a hit; but more critically for the live quarry guys, is it a clean kill? Think on. Quote Link to comment Share on other sites More sharing options...
EdSolomons Posted June 6, 2012 Report Share Posted June 6, 2012 "No mater what choke, skeet or extra full if you are on the target with the correct size and load of pellet, it's a hit." I would say that is not the case. You try shooting 50yard plus pigeons with a skeet choke and see how many come down. Same with clays. Quote Link to comment Share on other sites More sharing options...
bicykillgaz Posted June 6, 2012 Author Report Share Posted June 6, 2012 Thanks for all the info it's been interesting, I'll stick with 1/4 & 1/2 and see how I go. Thanks again Quote Link to comment Share on other sites More sharing options...
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