GOB,
If you can find one, buy a modern single shot in 32-20. They are all 308 and all 1-10 twist. With a 150 Rem bulk bullet and H-4227 you can get 1,600 fps out of a 10 inch Contender so with a bit of work I would think at least 2-300 better out of a 16-18 inch tube single shot and a tad slower powder like H-110 or 296.
I have done a good bit of work with modern 30-20s and the 30 Carbine with heavy bullets, up to 200s. Even built a custom DW revolver based on the Super Mag frame for a custom 30 Caliber rimmed straight walled cartridge called the 30 Harm.
Ed
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