I use Lapua and Winchester brass and find it does make a difference on the top end of things, I'll get pressure signs 1 to 2 grains sooner in Lapua. 51 grains of IMR 4064 with 150 Interlocks is hard to beat. I run 52 in WW brass. Another load is WW brass, 165 NBT's with 56.3 grains R17. I get 2950 with in my Kimber Montana with 24inch barrel. I can swap in a 165 TGK same same. 57 grains of R17 with virgin Lapua brass and a 155 Scenar runs 3080 and tiny groups.
Interesting. I've always primarily used Remington brass so never did much comparing but thought I read somewhere that Remington ran less capacity. Apparently not.
My load with Remington brass in a lot of 30-06's with IMR 4064 and 150's is usually best around 52 gr's which holds out with what you and Hiawatha are saying.
48 grains of H4895 with Remington brass & 150 Sierra PH has been accurate and consistent in 2 different 30-06's that I've shot it in so far. Not a speed demon, but easy to shoot and accurate. 3 shot groups down around 1/2" in a Sauer, and 4 shot group out of a peep sighted 7600 went just over 1 1/8" at 100 yds. 3 shot was under 3/4".
