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A faster twist should be an asset in stabilizing heavier bullets, you'll just have to make sure you can keep the overall length of the loaded cartridge short enough to cycle through the action.

I load my single shot .45/90 with a 500gr Lee bullet and 86grs of FF, a card wad over the powder and no grease cookie. For smokeless loads with cast bullets I use .45/70 data.

If you're going to exceed .45/70 smokeless data in the .45/90 do so carefully, it is a slightly bigger case but as everything else is equal to the .45/70 I would imagine pressures would be quite close with the same load.
 
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