Home Forums Reloading Big Game Rifles H414 and the 257 Roberts

I have no first-hand experience regarding the temperature resistance of H414, but I've found it to be a decent powder for the .257 Roberts. I can't recall if I've used it with the 100 GameKing, but I've used it with the 100 ProHunter.

Standard CCI-200 large rifle primers have worked fine. Perhaps severe cold might necessitate a need for magnum primers with this powder. Probably best to stick with the recommendations of a loading manual.

I looked at the data in the latest Hodgdon manual for the 100 Speer BTSP bullet. That one grain difference between starting load and maximum load looks odd.