Small base dies?

Typical response from those who know everything.

A Dillon rep on Dillon's forum once stated that ALL Dillon rifle bottleneck sizers are small-based. Dependable feeding ammo being the goal. You will know if you have a rifle where you need S.B. sizers. Mine is a Remington R25 chambered for .308. My regular RCBS sizer just will not make dependably feeding ammo for it...don't care how you adjust it. It just depends on the gun......it would seem that the more accurate a Semi is designed to be (think tighter chamber tolerances), the more chance you may need S.B.

Even small-base sizers don't size all the way back to factory.....they squeeze only the area in front of the extractor groove .001" or .002" extra. That's not much, but it seems to make all difference in a chamber made closer to minimum tolerances.

My argument for sizing all my semi-auto ammo these days with them is this: Next to factory they are more apt to chamber in any semi-auto I ever come in contact with, now or in the future. For rainy day ammo that's more important than worrying about getting one extra reload out of a piece of brass due to any mythical "over-working". What overworks brass in military-style semi's isn't dies, (unless you bump shoulders to the extreme) it's extractors banging the hell out of the brass on the way out....my opinion.