Well, 30 caliber 150-gr. bullets seated in 30 caliber cases with only about .150" of bullet body gripped by case mouths don't shift for all 8 rounds fired in Garands.
I've seated Sierra 168's and 180's that shallow in .308 cases and shot them in Garands with max loads; last round chambered had no bullet shift after 7 heavy recoil cycles. Decades ago, folks shot 180's seated in 30-06 match ammo cases the same amount and their Garands didn't shift them either.
Done the same thing with 168's in .308 cases shot from bolt guns; last round in the magazine has no bullet shift.
Do your own tests and see what happens.
Measure the bullet pull in pounds; that's what counts and it's the industry standard. Check the case neck length that grips 7.62 NATO M80 ball ammo's 148-gr. bullet behind its cannelure. Specs for its bullet pull (release force) is 60 pounds.