okay... I'll throw this out there for those of you getting really small runout numbers...
I have an older Sinclair vee-block setup, one of the newer ball-bearing units, and a NECO setup.
I saw where someone (Tom?) mentioned that different gauges reference off different points - the vee-block and ball-bearing units depend on the case body below the shoulder being perfectly concentric, and may give a very different reading than ones like the NECO where the round may be supported by just the bullet and the case above the extractor groove. This mirrors my own observations.
The question is... which one is 'right'?
I've been somewhat frustrated with this issue over the years, as I've never been able to get the super-low TIR values that I see discussed on the 'Net. Not consistently, anyways. In general, my loading equipment is about as good as it can be short of getting custom dies cut to match fired cases from my chambers, etc. I've used Forster, Redding, RCBS, Dillon, Harrell's & Hart presses, Forster, Redding & Wilson dies, quality components, done neck sizing, F/L sizing, variations of both, etc. and so on. If I went scrapping rounds that measure over 0.003" runout, I wouldn't have hardly anything left to shoot. Doesn't seem to matter what gun they come from, what caliber, what die or press is used...
Actually, 'frustrated' doesn't begin to cover it. Then again, the bullets tend to go where I point them, so I take a limited amount of consolation in that