Loads from the manuals have changed over the years and I wonder if the early manuals were pressure tested, if they were, they were tested by copper crushing method.
My Sierra #1 manual suggests 67.5 gr 4831 is max (H4831, I'm sure.)
My Hornady #7 manual says 65 grans of H4831 is max
Ken Waters in January 1981 said 68 grains of H4831 was a "good all-around" load for the 7mm RM with 140 grain Nosler Partition and 65 gr IMR4831 was max
Lyman manual #45 & #46 says 67.5 gr 4831 (H4831) is max
Nosler manual #2 & #7 says 66 grains of IMR 4831 is maximum
Speer manual #11 says 63 gr of 4831 (H4831) for their 145 grain bullet is max
Hodgdon manual #23 says 64 grains of 4831 (H4831) is max behind 140 gr bullet
If I were to find the max in my rifle, I'd run a few rounds past my chronograph. I think I'd stop at 3,100 fps unless there were pressure signs with less powder. I shoot 7mm RM's and in my notes, I either used RE 22 and RE 26 . I didn't find a record in my 7mm RM's of either 4831's, which is odd because I like both powders.
Sierra, Hornady, Nosler, and Spear bullets, all with different bearing surfaces. Weight is only one bullet specific variable.
