Alex1Nat2 Posted January 27, 2018 Report Share Posted January 27, 2018 I've recently acquired a 20 Bore Multichoke. Guy who I got it from said 'I just shoot with 1/4 & 1/2. Now I know these chokes are pretty standard with many game shooters when using a 12 bore (Me included) So the question is....... As the 20 bore tubes are smaller, does this really mean I would be shooting with much tighter patterns? Logically the answer is yes but just wanted to check there wasn't some technical ballistics thing I'm missing? I shot with it today & stuff I hit was hit hard with plenty of feathers out. For interest I was using 25gm 6's. I plan to check on a pattern plate but just interested in any info. Regards Steve Quote Link to comment Share on other sites More sharing options...
Paul1440 Posted January 27, 2018 Report Share Posted January 27, 2018 (edited) No. They should be the same. A choke marked as 1/4 in a 12 should in theory be the same as one marked 1/4 in a 20. That doesn't tell the whole story though. 1n a 12, 1/4 would measure at 5 thou constriction but in a 20 bore 5 thou would be tighter than 1/4. So in a 20bore a choke marked as 1/4 would have less constriction. Check out the choke charts on the Teague website. Edited January 27, 2018 by Paul1440 Quote Link to comment Share on other sites More sharing options...
Graham M Posted January 27, 2018 Report Share Posted January 27, 2018 (edited) The 12g should throw better patterns as it has a squarer charge. Edited January 27, 2018 by Graham M Quote Link to comment Share on other sites More sharing options...
Gunman Posted January 28, 2018 Report Share Posted January 28, 2018 (edited) 12 hours ago, Paul1440 said: No. They should be the same. A choke marked as 1/4 in a 12 should in theory be the same as one marked 1/4 in a 20. That doesn't tell the whole story though. 1n a 12, 1/4 would measure at 5 thou constriction but in a 20 bore 5 thou would be tighter than 1/4. So in a 20bore a choke marked as 1/4 would have less constriction. Check out the choke charts on the Teague website. Actually in 12 bore 1/4 choke would be .010" . Choke sizes will vary according to bore size ,if memory serves full choke in 20 bore is .025" ,3/4 .018", 1/2 .012" and 1/4 is .006". Different makers will claim slight differences on this , but rule of thumb take the full choke size and divide by 4 which would give 6 , 12 , 18 , and 24 thou . A thou either way will not make any difference , unless you are looking for an excuse because you cant hit anything . These are the measurements I have used for years without any complaint Edited January 28, 2018 by Gunman corrections Quote Link to comment Share on other sites More sharing options...
Paul1440 Posted January 28, 2018 Report Share Posted January 28, 2018 3 hours ago, Gunman said: Actually in 12 bore 1/4 choke would be .010" . Choke sizes will vary according to bore size ,if memory serves full choke in 20 bore is .025" ,3/4 .018", 1/2 .012" and 1/4 is .006". Different makers will claim slight differences on this , but rule of thumb take the full choke size and divide by 4 which would give 6 , 12 , 18 , and 24 thou . A thou either way will not make any difference , unless you are looking for an excuse because you cant hit anything . These are the measurements I have used for years without any complaint Yes your correct 010 not 005 in a 12. I actually edited my original post by mistake from 010 as I read the choke tables and got my facts mixed up. (Was late and I'm full of a heavy cold) Quote Link to comment Share on other sites More sharing options...
Fil Posted January 28, 2018 Report Share Posted January 28, 2018 12 hours ago, Gunman said: Actually in 12 bore 1/4 choke would be .010" . Choke sizes will vary according to bore size ,if memory serves full choke in 20 bore is .025" ,3/4 .018", 1/2 .012" and 1/4 is .006". Different makers will claim slight differences on this , but rule of thumb take the full choke size and divide by 4 which would give 6 , 12 , 18 , and 24 thou . A thou either way will not make any difference , unless you are looking for an excuse because you cant hit anything . These are the measurements I have used for years without any complaint +1 Quote Link to comment Share on other sites More sharing options...
spot.ontheroad Posted January 29, 2018 Report Share Posted January 29, 2018 On 27/01/2018 at 22:44, Graham M said: The 12g should throw better patterns as it has a squarer charge. So on an equal weight/size shot charge would a 20bore have an advantage on crossers by throwing a longer shot string? Just curious Quote Link to comment Share on other sites More sharing options...
Graham M Posted January 29, 2018 Report Share Posted January 29, 2018 I can miss with both Quote Link to comment Share on other sites More sharing options...
motty Posted January 29, 2018 Report Share Posted January 29, 2018 3 hours ago, spot.ontheroad said: So on an equal weight/size shot charge would a 20bore have an advantage on crossers by throwing a longer shot string? Just curious A long shot string is not an advantage. Quote Link to comment Share on other sites More sharing options...
figgy Posted January 29, 2018 Report Share Posted January 29, 2018 Forget all the shot string and other bore differences, if you can shoot it well that's your advantage. bore size doesn't matter all that much in normal shot charges or we would all be shooting 8 bores. Quote Link to comment Share on other sites More sharing options...
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