Many vintage American guns that I am familiar with were built with with full and full chokes, probably because of the popularity of waterfowl hunting and trap shooting. When these guns and their full chokes were made, there were no plastic shot cups. Today, a great deal of high quality ammunition - lead, bismuth, Nice shot and perhaps other soft no-tox ammo suitable for vintage guns - is made with plastic shot cups. Have any of you used ammo with plastic shot cups in your vintage full choke barrels, for example duck hunting with Nice shot or bismuth? If so, are you comfortable that the plastic shot cup leave the muzzle without negative impact on the chokes or barrels?
My 870 and 1100 trap guns have .038 and .037 constriction same as many of my classic doubleguns + or - a few thou. I too have shot thousands of rounds through classic doubles, all with shotcups and no issues what so ever.
