I always thought one the things the 270 has going for it was that pretty much until the 270 Weatherby and the 6.8 SPC, all bullets were designed for it. In say a .308 bore, you could use a 30-30 bullet in a 30-378 cartridge with poor results if it struck heavy bone on a close shot. Pretty much every .277 bullet for many decades was intended for the velocity range of a 270 Winchester. About the only mistake a hunter could make is using a bullet intended for deer on larger game, a mistake that surly been made often. Poorly designed bullets are another matter, and I'm sure there have been some. When this has happened with a cartridge that is so "standardized" bad bullets may become more associated with the cartridge than with cartridges with multitudes of bullet options.