I load nothing else in all calibres using lg rifle primers. The deal is that I work up my loads from scratch using these primers.
Magnum primers were originally developed for US military as cold weather primers for service cartridges.
They run a bit hotter, so if you were going to load these cartridges up to near factory based on non-magnum primers, don't. Back off about 1 grain and you should in most cases, be pretty close. 308 win is a very forgiving cartridge.
Just my opinion, but I prefer not to load any cartridge to the max. If I want more oomph, I go to a bigger or higher pressure round.