Bugger asked-How about the double 45-70 Remington imported from Russia.reamed to 45-90 plausible? Are they worth the trouble?

No, according to multiple gunmaker sources.

BTW, my .45-90 project was cancelled due to the untimely death of the gun maker. However, his estate did sell me one of his favorite hunting rifles, a Beretta .45-70 DR with 26 inch barrels. It shoots tight R&L groups at 50 and 100 yards and I have recently taken my first game with it.
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Last edited by crshelton; 11/09/18. Reason: updated

CRS, NRA Benefactor Life Member, Whittington Center, TSRA, DWWC, DRSS
Android Reloading Ballistics App at http://www.xplat.net/