338 Win Mag, Synthetic Stock, Semi-Auto, With Base and Rings, UNFIRED. Did You Know ? The "Big 50" Buffalo Rifle Cartridge is the 2 1/2" Case 50 Sharps. The bullet diameter is .509 while the 50 Winchester is .512. In this case length the 50 Sharps is also known as the 50-90, 50-100, and 50-110 depending on what bullet weight and powder charge is used. PAGE TWOINDEX