As a point of clarification, the .280 can indeed �achieve the same velocity with less powder� as a 7mm RM, but only within the limits of the .280 Remington. Case in point, Hornady 7th lists 162g bullets at 2800fps with IMR 4831 for both � 51.7g for the .280 and 56.2g for the 7mm RM. The difference is that 2800fps is top end in the Hornady manual for the .280 while the 7mm RM has loads to 3000fps.
Another point of clarification, the .280 was originally chambered in Remington, pump actions, and semi auto. They had to keep the CUP low, for those actions to safely function. Later manufacturing of the round in bolt actions showed they could handle pressures relative of those used in the 7mm. They called it the 7mm express Remington. So people wouldn't use it in the older guns. This caused a mess with the two chamberings being the same. So they went back to calling all the rifles and ammo .280 Remington. Only factory ammo was loaded soft in case the older guns were used. That's why factory ammo ballistics for the .280 arent that of the 7mm. Although hand loaders know the benefits.
