Up to this point in my reloading (nearly 50 years) I've not run across military .30-06 cases with a crimped in primer. Same for civilian/hunting ammo brass. Could be some military brass some where that had primer pocket crimps, I just haven't seen them yet.
Lightest bullets I ever had accuracy from was 147/150 grain bullets. Tried a box of 110 grain bullets a long time ago and never felt the need to buy anymore of them. Heaviest bullets I ever went with were 180 grain.
Best accuracy I ever had was with IMR4350 powder and Sierra 180 grain Matchking boat tail hollow points. That 03A4 loved those loads. No where near maximum (sorry don't remember the powder charge now) but they had a healthy recoil in that old rifle, but not a max charge either. It was only about 40 years old then. Much older now.
Best accuracy in my M1 rifles has been with standard 150 grain bullets (flat based FMJ 150 grain) and IMR4895 powder. Or with the Greek surplus HXP ammo the CMP used to sell. It's good brass for reloading, too, if you run across some at a good price.
Unlike .308 vs. 7.62X51 NATO brass the GI brass and commercial brass are pretty much the same weight after resizing and trimming to length. I've never reduced powder charge weights when using surplus/GI brass for .30-06 reloads. Never crimped the case mouth into the bullets either.
One powder I got good results from but have never pursued is TAC. Cheaper than a lot of other powders these days, meters great from the powder measure and gave me good groups from the M1 Garand with 150 grain Hornady FMJBT bullets.