47.0 grains of H-414 with 140 grain Nosler Partitions shoot well in my new 7x57. 48.0 grains, same powder, same bullets, was too hot. My son's 7x57 shoots 48.0 grains of H-414 very well, and 49.0 grains was too hot, all with 140 gr bullets.
Start low and work up.
