If you use mixed brands of brass in the S&W 52 you may have problems with functioning as some brands of brass is thicker than others. In this case use the Lee Factory Crimp Die. It resizes the case after the bullet is seated to what Lee calls high factory specs for loaded rounds. Have never had a problem again. Just don't load too hot with HBWW's as you can blow the bases off and ring you basrrel on the next round.