Get a Wilson case gage and use that gage to set up your sizing die. Chances are, you don't need a small base die. If I set my sizing die up the way Inspector 3711 suggests, I'd never bump the shoulders enough for proper headspace. I have to adjust the sizing die so that it's actually making contact with the shellplate, sometimes even camming over a little.
I also use an o.a.l. of 2.260", which is about the longest that will fit in an AR magazine. I never have ammo-related failures.
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