To add another capability in the field big game hunting, I have used and tested a few cartridge adapters; .32 ACP in a 7.62x54, .32 ACP in a .30-40 Krag, .32 Short Colt in a .30-30, and a+ .25 ACP in a .250-3000. With the exception of the .25 ACP/.250-3000, all are very capable at my tested 25 yd mark; no surprise with the latter, given the smaller diameter bullet; however, it is still capable of taking a barking squirrel out of a tree while in your stand. You might as well put it in your pot, as it has already alerted every big game animal within 10 square miles that you are there. Accuracy at 25 yds/5 shot group typically ran around 2.5'' with the .30-30/.32 SC the best at about 1.5'' The adapters that I tested were all all made by Marbels, but Winchester and others offered them as well. New varieties are being offered by Ace/MCA Sports in Anchorage, AK for those that might be interested.