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Hello Igorrock,

The 350g bullets I got from Hawk measure .424" - .425" diameter. I'm not sure what the nominal bore and groove dimensions are for the 10.75x68. Do you know?

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My own Mauser Type A which started life as a 10.75x68 now opened up to 10.75x73 (404 Jeffery) has the barrel stamped on the underside, 10.45mm and 10.75mm (that's .411" bore and .423" groove). It shoots both the 10.75x68 RWS 347gr bullets and .404 RWS 400gr bullets perfectly.

My own and others 350 - 400gr cast bullets sized .424" shoot fine in this rifle too.

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