@Racinready300ex Been loading with nothing but Federal Match SP primes for MANY years, and in my experience, they are without fault in the RL1100 or previous XL650s. I usually load in passes of 500-1K; and just load up however many I need using Dillon PPU tubes with my PAL Filler. If my machines priming system is clean, I have "0" upside down primers............