NightStalker,
That would be what I would do. Actually probably .309 cast bullets.
Stan,
Try and find a 7.62x39 barrel that some one is willing to part with.
Last night I put a 7.62x54 empty into my 45-70 barrel, the ejector worked but I could see the rim being to small for a 45-70 ejector. I also tried the empty in my 410 barrel, it wouldnt chamber but it appears that ejector would be small enough to expand out to work properly.