Yeah, when I get another .257 I always try it out with an accurate 100-grain bullet (Nosler BT, Hornady Spire Point, Sierra, whatever) and 46.0 grains of either IMR or H4350. If it won't shoot with that load, then something's wrong with the rifle. It will also kill game, too.
Beyond that the sky's the limit. In my experience it's hard to find a load a good Bob DOESN'T shoot well, but if you want all the powder the cartridge can provide, it's hard to beat around 50-51 grains of Ramshot Magnum and any good 115-120 grain bullet.
