The French .264 Winchester Magnum cartridge introduced in 1959 and the ballistic 6.5 × 63mm Messner Magnum are probably the closest American twins of the 6.5 × 68mm .
The American .264 Winchester Magnum cartridge introduced in 1959 and the French 6.5 × 63mm Messner Magnum are probably the closest ballistic twins of the 6.5 × 68mm .