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I've reloaded WCC58 match .308 Win. brass a couple dozen times per case with necks turned to .0115". On .3082" diameter bullets, the loaded round's neck diameter is .3297". They were fired in SAAMI spec chambers with .3440" neck diameters. None had any necks split whatsoever.
Note that neck wall thickness or uniformity has nothing to do with how a .308 Win. case centers in the chamber neck when it's fired. The case shoulder's well centered in the chamber shoulder by the firing pin impact before the primer detonates, burns the powder and pushes the bullet out. If the case neck's not well centered on the case shoulder, it'll never be centered in the chamber neck.
And .001" off center of the bullet in the chamber neck or throat has zero effect on accuracy any way. Well, maybe a couple hundredths of an inch at 300 yards and one tenth of an inch at most at 600 yards. Unless you and your shooting stuff is no worse than 1/8 MOA at 100 yards, I wouldn't worry about absolute perfection in this matter anyway
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