I was looking for reload data using H870 powder. I found it one of my old reload books copy right 1971 from Sierra. Just trying to find out if the weatherby Wright Hoyer is the same cartridge as the new weatherby 6.5-300. This old Sierra book shows loads using H870 of 82.0gr to 86.0gr with a 140 grain Sierra bullet
NOT a reloading site . try one of the reloading online forums.