I got word back from RRR this morning. They have heard of these rifles before and advise using light cast loads with IMR-4198 or IMR-4227 powders but did not provide any grain information.

So now I have to decide whether to keep it, look for a barrel in addition to everything else, continue with my original plan and make it look like it should building on the original stock, or part it out.

Leaning towards original plan while watching for another barrel.
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