8mm Mauser is a good round. If you want to go with black powder then the 11mm Mauser or one of the 50 caliber repeaters such as a Spencer might be ok.
There were some very large caliber rounds used during WWI. iirc a 20+mm Mauser and similar rifles used by the allies.
The Winchester 1895 was issued to the Russian military in 7.62x54r.
Of course you could consider a military shotgun in 12 gauge. Several types of ammo were used in pump guns from slugs to various types of shot.
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