30 Rem. case, the 6.8 SPC uses a 0.277"-diameter bullet that doubles the weight of the most popular bullets in the .223 Rem., but with only a moderate reduction in velocity from a short barrel.

223 Rem.) some 10 years later ... but it was ultimately decided that the 6.8x43 mm Special Purpose Cartridge (SPC), with a 115-gr. bullet moving at 2600 f.p.s. from the muzzle offered the best ...