.55-28ga. works for squirrels, turkey,rabbits. my 50 woodsrunner barrel was sent to bobby hoyt to be a .55 smoothy, does nice pattern #6, 58gr. 3f, hard card,28 shot cup piston cut off, 1oz #6, n wet 1/2 fiberwad, .53 ball n denium lubed patch. 3-4 in same powder at 50yds.