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Hello Rule303,

I didnīt touch my rifleīs chamber! The normal European 7mm Mauser chamber has this dimentions.

The C.I.P. chamber standard for the 7x57 is:

https://bobp.cip-bobp.org/uploads/tdcc/tab-i/tabical-en-page33.pdf

By the way, I do the same thing with my 9,3x62. Because the magazine lenght of my BRNO ZKK is almost 89 mm and because the veeery long Commencement of the rifling in the standard 9,3x62 (28 mm...!!), the cartridges can be loaded much longer than the factory ones without any trouble. And feeds very fine! This increases the volumen of the case notably. And permits the use of many of the bullets loaded with the base at the shoulder-neck junction.

The C.I.P. chamber for the 9,3x62 is:

https://bobp.cip-bobp.org/uploads/tdcc/tab-i/tabical-en-page69.pdf

Sorry for the deviation of the original post theme about the new 6,8 mm cartridge. Anyway, I thought that data are somewhat related.

Best!

PH

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Hi PatagonHunter,

Thank you and the following posts answers questions I had. The European manufactures must go for long throats and that makes sense as they often loaded long heavy for calibre rounds. I can comfortably drive a 140 grain .270 bullet at 3200fps in my Steyr. That is up there with the 270 Weatherby. I run it at 3100fps as a very slightly more accurate. As you may have gathered I like throats long enough so I can use the full magazine length.

We are now back on track talking 6.8mm rounds