I'm a bit curious about those speeds too. I think I stopped at 49.0 with 120 NBTs in my rifle. 50.0 grains is 3.5 grains 'hotter' than Nosler calls max in the slightly smaller 260, and 1.8 more than Hodgdon maxes at with the 140 Speer SP. Hodgdon shows 45,800 CUP so there's some room in a M70 for bumping it no doubt.
I'll try to get a couple more loaded up and chrono them.
I used Hodgdon online data to get an idea. All of the loads looked and felt good during extraction. I'd actually be plenty happy with any of them to be honest. It seems like my 70 really likes 140's more than lighter Bullets. Tried 130 Scirocco, 130 AB, and 120 Northforks but the 140 ABs easily outshot them all.
It does do well for a light recoiling load using H4895 and 120 BTs though.
