Ok so I got a set of reddings type S bushing dies for SAAMI 280 AI (I'm using nosler brass). I measured it right at the mouth and got .309, just a touch below that was .308, and it was the same for 2 cartridges (I'm measuring some of nosler's custom competition 150gr E-tip ammo). So should I just get a .307, .306, or both? What are you guys using? Thanks!