I can only guess you are one of the reloaders that have concave-d and convex-ed case heads.
I have no idea what the shape is, but I always load to the low end of the spec. For a primer pocket to stretch means the web is expanding, which it can't do at moderate pressure. Wether concave or convex, if you load hot the brass ruins quicker. If the web expands the brass is scrap.
It's the fashion to launch bigger bullets faster than anyone else with the same caliber. I'm not a fan.
My son was a big fan of that. When he got his own rifles, I helped him with the load development, but the numbers in the book were bigger than his, and he coveted those numbers. After I explained why it was a bad idea, he went ahead. His cure was taking a hit to the pocket having to replace his entire batch of match brass after two firings, costing him a match on the other side of the country because his rifle started leaking primers.
I've reloaded the same batch of 308 Norma brass for some time. I don't count the total uses, only the uses between anneals, but total is around 10. Other than losing a case to improper lube, I still don't have any worn out brass. No cracked necks, no internal signs yet of case head separation. The brass is looking to outlast the barrel.
I been doing the same for big bores with the same result on the brass.
Instead of trying to push the limit of velocity and bullet weight, I have a bigger caliber that can do more at the low end of it's spec.