My suspicion is that this is simply a function of brass life, but interested to hear if someone has other experience or opinions. Have experienced head separation before and had a separate thread on that related to early separation on some Norma brass, but I have never seen this particular issue before.
Case separation just below the shoulder.
Lapua 223 Match, converted to 223AI.
23 firings with anneal between every firing.
Full Length Sized, 0.002 bump
Loads are rather mild at 23.8 gr Lovex S062 ( SW Precision), 88 ELDM, 2680 MV
Primer Pockets are still tight
Case separation just below the shoulder.
Lapua 223 Match, converted to 223AI.
23 firings with anneal between every firing.
Full Length Sized, 0.002 bump
Loads are rather mild at 23.8 gr Lovex S062 ( SW Precision), 88 ELDM, 2680 MV
Primer Pockets are still tight