Sierra GameChanger 270 Winchester Ammo 140 Grain Polymer Tip Box of 20

Last reviewed: 2026-04-19 by Jake Terry, FFL07/SOT3, NRA-certified firearms instructor.

For mule deer, pronghorn, and sheep hunters who measure success in clean one-shot kills at extended range, 270 Winchester ammo remains the benchmark American hunting cartridge nearly a century after Winchester introduced it in 1925. The Sierra GameChanger 140-grain polymer tip load delivers match accuracy — inherited from Sierra’s MatchKing lineage — married to a hollow-point design engineered for controlled expansion across typical hunting distances. You get 2960 fps from a 24-inch test barrel, 2723 ft-lbs of muzzle energy, and a 0.508 G1 ballistic coefficient that keeps the bullet supersonic and on-target past the point where most western shots are taken.

Built for the Box

Sierra engineers started with the ogive and boat-tail geometry proven in competitive match bullets, then re-worked the internals for terminal performance. The transparent green polymer tip initiates expansion the instant it contacts soft tissue, driving into an open cavity that allows the lead core — a proprietary alloy chosen for controlled deformation — to mushroom predictably. Jacket wall thickness is tuned to retain 65-75% of original weight while shedding petals that create a wide wound channel. Brass cases carry boxer primers, are non-corrosive, and reload without issue. Each box holds twenty rounds. Country of origin: United States.

Specs at a Glance

The 270 Winchester has earned its place in American hunting culture by balancing flat trajectory, moderate recoil, and wide commercial availability — attributes that matter when you’re glassing ridgelines three states from home. Explore our full inventory of 270 ammo for additional bullet weights and manufacturers.