Ok so my oldest son has caught the Creedmoor bug. He doesn't know it , but is getting one on his b- day on Saturday. I've already got the rifle , dies , 3 boxes of Nosler brand ammo 120 gr ballistic tips , and I thought I done good by buying a 50 count box of Hornady brass. I was just reading in another thread here about the Hornady brass and others are saying brand x uses a large primer and brand q uses a small rifle ? Why the hell would there be different size primers in the same caliber? I've been reloading for 10 ish yrs and this is the first I've heard tell of this . But maybe I don't get out much. Can someone please explain. Is the small rifle primer more accurate maybe ? And if so why would they create such maddening differences