ChrisAsh Posted January 12, 2016 Report Share Posted January 12, 2016 From Wikipedia Quote " A 12-gauge shotgun, nominally 18.5 mm (0.73 in), can range from a tight 18.3 mm (0.72 in) to an extreme overbore of 20.3 mm (0.80 in)." Chokes are measured as a percentage restriction on the bore so a ,01% restriction on a bore of 18.3mm will be different to one using a overbore of 20.3mm and all in between Choke gauges are normally set up for the average 18.5mm and therefore will be quite accurate for some guns and not so accurate on others purely depending on the actual bore of the gun Choke restrictions Cylinder 0.000inch Skeet 0.005 inch Improved 0.010 inch Mod 0.020 inch Full 0.030 inch So you can see the amount is very little and bore size can make a big difference Quote Link to comment Share on other sites More sharing options...
daveboy Posted January 12, 2016 Report Share Posted January 12, 2016 Serious question. Are snap caps not any good for setting your trigger.(I know you can use a fired cart but it would have a big dint in the primer) Quote Link to comment Share on other sites More sharing options...
bostonmick Posted January 12, 2016 Report Share Posted January 12, 2016 (edited) I use snapcaps to release the trigger spring on my gun which has a v spring and if left under tension for long periods can be prone to break.I believe the coil springs do not suffer the same although I still release those.If you are out shooting and a v spring breaks it's game over but a coil will still work inmost cases broken.So yes they do have uses. Edited January 12, 2016 by bostonmick Quote Link to comment Share on other sites More sharing options...
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