Federal primer cups are smooth. I do not know if it makes any variation in handguns, but they are not suggested for use in a very Garand. The Correct Powder manufacturing facility technician was simply telling me that it was safer to make use of a slightly more durable primers https://winchesterlargepistolprim41973.blogolenta.com/28746977/considerations-to-know-about-federal-gold-medal-small-rifle-primers