Mckee & Mason 640 Hall Carbine BulletFor your consideration one McKee & Mason 640 Hall Carbine bullet. You will find this bullet to be in very good to excellent dug condition. The patina is a really nice white to tan color. Both raised rings are well defined & notice the taper to the base of this bulletto me this is what sets this bullet variety apart. The solid base is smooth & a trace of the original black powder can still be found on the basesee base photo. Measures about 0. 545 x 0.