Nice to chat about this stuff.
My fired OD is .296, neck walls measure .013-.014. The loaded neck ODs are .291. Bullet easily slip fit into fired neck mouths.
Sgs for the 8-twist using 147 ELDM's & other.
View attachment 496506
Stability looks good, Sg's about 1.8.
I have had sudden accuracy degradation & the cause was neck wall thickening causing inconsistent bullet/neck/chamber clearance. When reforming .30-06 to 6.5-06, neck turning is required to get .291 OD bullet loaded necks with my .30-06 brass. Not so with .270 W brass reformed to 65-06.