I believe the .40 cal. is the best all around caliber for offhand target shooting. Since more of the targets are usually at 25 yds., with some at 50, and the least at 100 usually. The .40 doesn't do bad, even in a light wind at 100. Having said that, the rifle I shoot most in competition is a .36 flint. But must admit any wind is a problem with it at 100. On a calm day it is fine. If you expect to shoot more longer distances, then possibly go up to a .45. :thumbsup:
That's my opinion, and hope it helps, see ya, Jim/OH :hatsoff: