I think Keith has identified the real challenge. Wall thickness and liner OD. From Redmonds .22/.311, .17/.311, 38-40/.590, 32-20/.505 and 25-20/.435. Maybe the 25-20 if the .410/rook walls are thick enough. The .22 would require bushings for the liner
And reworking a firing pin. But a muzzle bushing could made eccentric to allow adjustments for regulations. Its a shame in many ways. The obsolete .300 rook rifle cartridges would make for a sedate plinking rifle.
Last edited by KY Jon; 04/04/19 09:19 AM.
