Not trying to snipe here, just a little clarification: SAAMI spec for .308 Win shoulder angle is 20 degrees from centerline. 7.62 NATO spec is 40 degrees overall, from shoulder to shoulder. It's the same angle...GI1
Have you considered that you may be lengthening the cases when pulling them back over the expander ball of the sizing die during the downstroke after sizing?
Try sizing a case without the cecapping rod and expander ball installed as an easy check.
+1... my father ran a test on this. He has a Rem 700 with a really tight and true chamber. He would measure the case neck runout on fired cases and the necks would be almost perfectly true and straight, near zero runout. Then after resizing, he would measure again and not only were the cases stretched longer, but the expander ball would pull the necks out crooked, the necks had more runout after sizing than they did when they came out of the rem chamber after firing...
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