There are 2 different Hevi-Shots. The one called Classic Doubles is a different mixture than regular Hevi-Shot. Haven't tried them just know what I've read. Thankfully I stocked up on both bismuth and Kent TM several years ago when they would go on sale. At$75 a box of 25 either my shooting skills on waterfowl has to improve or I'll have to use some of my steel capable SxSs.