0.50 Caliber Colt Revolving Rifle BulletFor your consideration on 0. 50 caliber Colt revolving rifle bullet listed in the Thomas handbook as 84 Two grooves with a rebated base. You will find this bullet to be in excellent dug conditiona choice condition bullet! The patina is a smooth, even white color & I do not see a single patina chip. The solid base is smooth & the nose is pointed. One mold seam can be faintly seen & a small amount of dirt has been left in the rings. Measures about 0. 51