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$19.66
Winchester Game and Target 21 Sharp 37 grain full metal jacket USA21 ammo pairs the newer rimfire chambering with a jacketed bullet designed around a non-expanding nose. Unlike the solid flat-nose version in the same lineup, the full metal jacket makes projectile construction the principal distinction for this 100-round target-shooting configuration.
Winchester developed 21 Sharp to accommodate modern bullet geometries instead of the heeled bullets traditional to 22 LR. The workbook lists this USA21 loading at 1,370 fps, a useful reference when sighting in a firearm specifically chambered for 21 Sharp. Similarity in cartridge appearance does not make 21 Sharp ammunition interchangeable with other rimfire chamberings.