The number .270 is the caliber that a rifle is chambered in.It is number applied to the .270 Winchester caliber.This fires a .277 cal.bullet and the case of the cartridge is made by necking down the 30-06 case to except a bullet of .277 cal. These bullet weights range from 110gr. thru 160grs.the most popular is a weight of 130grs.
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