Hodgdon max load is 59 gr H4350 with 140 gr 2,927 fps 50,000 CUP, but I find the threshold of extractor groove growth to be at 72 gr.
I find 70 gr 3.34" Nosler Ballistic tip moly has plenty of safety margin for all my rifles over all my hunting temperature ranges to ensure long brass life over many years. It varies between rifles, but typically 3400 fps over the chrono.
So your "safety margin" load is 11 grains of powder and over 400 fps above book? I am beginning to see how you went through nine rifles.
