 guidelines the 6.5×63mm Messner Magnum case can handle up to 440 MPa (64,000 psi) piezo pressure.The idea behind the 6.5×63mm Messner Magnum was to develop a very powerful 6.5 mm long range hunting cartridge that achieves very high muzzle velocities out of relatively short 600 mm (23.6 in) long rifle barrels.The developer, Joseph Messner from France, chose the 9.3×64mm Brenneke as parent case, since it offers enough case capacity and a competent gunsmith can relatively easy rechamber a standard Mauser 98 or any other bolt-action rifle to accept 9.3×64mm Brenneke based cartridges.