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The 8mm Mauser was designed for a 198 grain bullet in 1934, I doubt if a 220 grain bullet will give you trouble, but check your reloading manuals and see what they say. There's not much room in the case with a 200 grain bullet seated for correct length, so anything over 220 grain could give you some issues.
I'd get your Russian Capture checked out by a gunsmith first, and run some factory loads through it beforehand.
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