gas checks for .41s are a little bit of a pain. there are at least 3 different sizes. Lymans usually fit lyman molds and lbts the 416 hornadys fit some of the others and theres some kind of inbetween that nothing seems to fit just right. Good news is Gator checks Larry will make them to fit your bullet and his prices are cheaper then any of them and he uses thicker material to boot. this is his contact infor
Bullet Swaging Supply, Inc.
303 McMillan Road
West Monroe, LA 71291
318 387-7257