In addition to having no specific bearing surface, brand x bullets have an OAL length to rifling of 3.464", .084" longer than the next longest bullet I have in the same rifle. The base has a slight circular projection that is not present on anything else I have. These bullets are not a match for: Sierra 168BTHP, Sierra Matchking, Speer 168 Target Match, or Hornady 168 BTHP. These may be blems or imports.