Does the 7mm Remington Magnum perform best with a 24" or 26" barrel?
Define "perform"..
What could I expect to gain over a 22" barreled 270 Winchester?
Ballistically, the 7MM Rem Mag has a decided edge on the .270 Win. But I doubt if it'll kill any deader than a .270 Win. It's all about where a bullet goes.