While the 87 grain load in the 250-3000 might be aimed at the 1-14" ROT rifles, the same bullet in the 257 Roberts would seem to be out of place given the lack of ROT restrictions and the other available bullet weights.
Maybe, maybe not. The 87gr. loads in the Roberts could've likely been to assuage gunner's desires for higher velocity/flatter shooting ammo, while using a suitably constructed bullet.
