Have any gunwriters used this one before? Any thoughts/comments on it?
It supposedly gets 3200+fps with 140 gr. bullets out of a 23.62" barrel.
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The 6.5 x 63 Messner Magnum
The 9.3 x 64 Brenneke case has functioned as the parent case for the 6.5 x 63 Messner Magnum, which's essentially a 6.5 mm (.264 in) necked-down version of the 9.3 x 64. The wildcat status of the 6.5 x 63 Messner Magnum ended in 2002 when it got C.I.P. certified and became an officially registered and sanctioned member of the German 64 mm "family" of magnum rifle cartridges.
The 6.5 x 63 Messner Magnum has 5.42 ml (83.5 grains) water cartridge case capacity. 6.5 x 63 Messner Magnum maximum C.I.P. cartridge dimensions. All sizes in millimetres (mm).
Americans would define the shoulder angle at alpha/2 = 29 degrees. The common rifling twist rate for this cartridge's 200 mm (1 in 7.87 in), 6 grooves, � lands = 6.45 mm, � grooves = 6.70 mm, land width = 3.50 mm and the primer type's large rifle magnum.
According to the official C.I.P. guidelines the 6.5 x 63 Messner Magnum case can handle up to 440 MPa (63,816 psi) piezo pressure.
The idea behind the 6.5 x 63 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 (23.62 in) long rifle barrels. The developer, Mr. Joseph Messner from France, chose the 9.3 x 64 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 x 64 Brenneke based cartridges. Beside the 6.5 x 63 Messner Magnum rimless rifle cartridge Mr. Messner also designed a rimmed version for break action rifles of the cartridge called the 6.5 x 63 R Messner Magnum.
