The .270 Winchester has a significantly longer case length (2.54″ vs 2.015″) as well as overall length (3.34″ vs 2.81″). For this reason, the .270 Winchester is used in standard/long action rifles, while the .308 Winchester is the poster child for short action rifles. Both cartridges...
The proprietary nature of the 6.5 Grendel also really hurt rifle development for a long time, as did the fact that the unique rim diameter of cartridge required shooters to get a new bolt face and magazine in addition to a new barrel. On the other hand, converting a rifle from .308 Winc...
The .244/6mm Remington was not a commercial success for the company, but Remington got the chance for redemption a few decades later when they finally legitimized another wildcat derivative of the .308 Winchester. Wildcatters had been necking down the .308 Winchester to 7mm for years, but fo...