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Peter

Lets not get too carried away with bullet diameters. There is plenty of information around about the different bore diameters of the old German and British DG rifles, with those for the .404J and 10.75x68 Mauser cartridges being no exception.

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There never was a 400gr factory load for the 10.75x68. All things being equal, it is ballistically impossible to match the .404J using a smaller case especially if maintaining reasonable DG working pressures and bullets seated to normal depth with a crimp applied. Experimental loads for the 10.75x68 duplicating the 404J and having out of spec pressures and cartridge lengths are only good for the target and probably not good for the gun.

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Why bother attempting to achieve that, just use the 10.75x68 as it is for fun and get a 404J for even greater fun, and for DG.

Eagle27

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the reason is that you can get some beautyful german guild guns for a very low price, and the makers intended those guns as all purpose guns hence the hop up in loadings.

best

peter

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