Annealing question

[FLshooter]

My opinion/experience on split necks is that they are mostly caused by tooling marks on expander balls and/or use of Imperial Sizing Wax too thick.

I've had one split neck with Lapua brass when I was using Imperial Wax on a roller pad. I think I was pushing my necks around way too much.

I switched to Hornady One-Shot spray-on lube and haven't had an issue since, and that was many years ago.

I have tried imperial wax and several types of case lubes. I’ve always gone back to RCBS case lube and the RCBS green pad. It’s always worked best for me.I usually start seeing split necks after 5 or 6 reloads.