I'd love a barrel in one of these for my Mauser 03. Pity custom barrels aren't available.

The .375 Hölderlin
The 8x68mm S case has functioned as the parent case for the .375 Hölderlin (9.5x68mm), which is essentially a 9.53 mm (.375 caliber) necked-up version of the 8x68mm S. The wildcat status of the .375 Hölderlin ended in 2007 when it got C.I.P. certified and became an officially registered and sanctioned member of the German 68 mm "family" of magnum rifle cartridges. If the .375 Hölderlin will become available as factory ammunition, like the older cartridge "family" members (8x68mm S and 6.5x68mm), is still unknown.

Similar to a .375 H&H Magnum.

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.375 Hölderlin maximum C.I.P. cartridge dimensions. All sizes in millimetres (mm).

Americans would define the shoulder angle at alpha/2 ≈ 14.53 degrees. The common rifling twist rate for this cartridge is 305 mm (1 in 12 in), 6 grooves, Ø lands = 9.30 mm, Ø grooves = 9.55 mm, land width = 2.92 mm and the primer type is large rifle magnum.

The .375 Hölderlin has 5.65 ml (87 grains) H2O cartridge case capacity. According to the official C.I.P. guidelines the .375 Hölderlin case can handle up to 440 MPa (63,816 psi) piezo pressure.

According to the creator of the .375 Hölderlin, Mr. C. Otterbein, the idea behind the .375 Hölderlin was to develop a big game cartridge based on a German cartridge case for standard sized Mauser 98 bolt action rifles. The ballistic performance had to be close to or equal the performance of the .375 Holland & Holland Magnum. The 8x68mm S was chosen as parent case, since it offers enough case capacity and a competent gunsmith can relatively easy rechamber a standard Mauser 98 rifle to accept 8x68mm S based cartridges. To keep costs down and promote an acceptable recoil level blowing out the parent case was renounced.

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