This is good information! I've struggled this past winter, trying to find a repeatable prep process that yields consistent neck tension with these Peterson brass for my 6XC. I recently had a bad outing doing a ladder test with a new bottle of H4350 (way hotter than previous bottle) and wound up pulling down some 110 SMK loads that I had rotary tumbled HBN into for 12 hours. Yes, 12 hours. Its cool down in my Air Conditioned house basement. Takes a long time to feel like the plating was successful. Anyway, when I pulled the bullets, they were scraped clean down to the bare metal. This was new, no-turn, Peterson brass with a .242 mandrel applied to them and they were still way too tight going in. I wasn't shocked to see them scratched coming out, ruined by my standards. I've had better results turning those Peterson .015 neck walls down to either .0135 or .014 before applying the mandrel. It seems to break the OD surface tension. I haven't Moly'd bullets since before the wet process came into vogue. I will give that a try on the next batch I run. I also dusted the inside of the necks with HBN, prior to seating and with the no-turn necks, it was like trying to push a nail into a board! I have experimented with increasing the dwell time on the mandrel but to no avail. I'm always open to trying a change in process if it helps and I'm ready to purge my Peterson brass if something doesn't give soon. We have a short, comfortable weather, shooting season up here. Hate wasting time and money.
Hoot