I've tried it im my stw at 80 grains and lost a lot of velocity compared to h1000. I use the Berger 180 vld though so slow powder is what I need.
Give it a shot and see what happens. We stuffed each 100 grains of h50bmg and h1000 into a 300 tomahawk with 210 bergers and the h1000 produced 3300 fps while the h50bmg produced 3100 fps.
Just for comparison maybe to help you.
Good to see ya Dantec.
H50BMG gave probably the WORST groups in my 7RUM from 8 different powders. Retumbo has been fairly accurate, but like you I've had excessive pressure early on with alot of empty case below the shoulder.
Try some 5010 pulldown powder. It may accelerate throat erosion, but it's been the most accurate for me. www.gibrass.com