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The riffling is very fine almost like it was made for copper jackets. So the paper is mostly to keep it clean. I assume the wax in the wad stack fills the groves as the bullet passes. I thought about just using .458 bullets but I think the breach pressure would go up as opposed to using cotton paper patching. And It's a large round, 45-90 in American lingo so I have no idea of how much spare strength is built into the action. I do know that the 1886's had forged blocks, but they still pivot on the same 1/4 inch split pin. With my trapdoor Springfield's I use 45-60 carbine loads and patched bullets are more accurate than lead pressed to .457 which is what the barrels slugged out at.
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