ALL my dies are RCBS with the sole exception of a set of 257 Reddings and 450/400 Hornady's. Have never had a problem with any of them and that is for over 17 different calibers. Most of my 416 Rigby brass was BeLL (Mast) and Norma. Had no problems with either case. All shot in a CZ550 custom. All used in Africa with good results. Bullets were all Woodleigh's. Either solids or softs.