I did a bit of load testing for my 375HH M70. I was pleasantly surprised at shooting a 300gr barnes tsx and IMR4064 most all the charge weights printed around 1 inch at 100yards. Seated the bullet at 3.570 which is barnes published spec. Its really a nice safe load that functions well. I loaded up 20 more at 67.0 grains for practice and further testing. My thought is this, Its accurate enough at moa to hit at 300 yards, is seated deep enough to feed well and powder is mid range so I do not have to worry about over pressure on a hot day. If this was a smaller bore rifle I would play with seating depths and maybe other powders and really work in down to maybe 1/2 moa. But do I really need to?
I am tempted to load up some varget and see how that does, but then why waste the components?