PETERSON CARTRIDGE 6MM GT BRASS Match-Grade is a standard that must be held throughout the entire process of manufacturing some of the most consistent, accurate, and durable brass rifle casings available today. From their small batch production lines to their quality control department, to your bench, and on to the range. Match-grade is the standard that Peterson strive to achieve so that their customers can maintain that standard all the way to the target. NOTE: All their SRP casings feature a small flash hole in the diameter of 0.060" vs. the 0.080" flash hole found in their LRP casings. This means you will need an X-small/ Undersized Decapping Mfg: Peterson Cartridge