Just to back up what other people have posted, if a .257 won't shoot well with a 100-grain bullet and 46 grains of H4350, then there's something wrong with the rifle. I've loaded for about 12-15 .257's and the only one that wouldn't shoot with this load was a Ruger No. 1B with a very long and loose throat.
This is by no means a maximum load, usually getting 3000-3100 fps depending on barrel length, but with the right bullet will kill any whitetail or mule deer quite handily.
