I'm curious how you determined that FGM 168s are jammed .075"? Is that just from comparing OAL with your loads? Better measure that again; the ogives may be different between the 168 SMK you measured and the FGM ammo. Even different batches can vary some, although not generally that much.
I have a hard time believing they'd chamber without significant effort at .075" jam; you'd have to push on the bolt handle hard enough to seat the bullet deeper. Are you closing the bolt with a mallet? If not, that .075" number is probably not correct.
Using Hornady OAL Guage, Hornady bullet .308 comparators, SMK 168gn bullet per usual and as instructed.
Bullet is lightly set on the lands. Average measure is 2.145 Ogive and/or 2.725" COAL.
Factory Gold Medal Match 168gn ammunition measures 2.8" COAL AND Factory chambered and ejected ammunition without firing shows consistent scuffs (not gouches) on bullet at ogive. Factory loaded ammo at 2.8 chambers just fine.
Factory FGMM 168gn measure 2.210 ogive.
