Norma Whitetail 270 Winchester 130gr PSP Rifle Ammo – 20 Rounds – In 1925 Winchester introduced a .30-06 case necked down to a bullet diameter which until then never had been used by any other European manufacturer: .277in. The result was to become one of the most popular hunting cartridges in the world. When introduced it offered better long range performance than any other available big game cartridge. It was never called by its metric designation- 6.9×64 -but kept its American name of .270 Winchester. The success of the .270 was partly due to the fact that it has a combination of a flat trajectory and a very manageable recoil with the standard 130 grain bullet. At normal hunting ranges a well placed bullet from a .270 means instant death to all species up to the size of mule deer, and many hunters prefer it for mountain hunting as respectable muzzle velocities and equivalent trajectories can be had from a 22in or even a 20in barrel. One Of The Most Popular Hunting Cartridges In The World Flat Trajectory And A Very Manageable Recoil Respectable Muzzle Velocity