Individually, I exploit 210M’s or 215M’s when I go looking, based on the cartridge. It offers me relief. But I don’t know when you’d ever see a measurable difference between The 2. Primers are certainly one of the cheapest parts we buy, but might be important to consistent muzzle velocities https://paxtonkbmxi.dreamyblogs.com/32190634/not-known-details-about-federal-ammunition-primers