I was thumbing through Midway's sale catalog and came across 6MM BR brass. I am going to quote directly from the catalog: 6mm BR,Bench Rest),primed .080 flash hole -this is Remington Brass. Previous page - 6mm BR,Bench Rest) - this is Lapua brass. Isn't 6 BR brass suppossed to have a .060 flash hole? Are these 2 interchangeble if so why would you want to. I'm confused. Also, why does the Remington brass come primed.