i did the same thing to a sidelocker lefever in 30-40 krag. cut the barrels back to 24 inches. i fitted round bushings in the muzzle of each barrel [snug fit]and the hole in the bushing
where the barrel came thru was a little loose. i drilled and tapped the bushing at 12-3-6-9 oclock. i used cap screws with an allen head so the head was below the surface of the bushing i was able to regulate the barrels quite easely by loosening or tightning opposite screws or rotating the bushing. had the bushings and barrels welded in place. it shoots 1.5 inch apart @ 100 yards parrelel to each other. i used a set of remington model 700 sights that worked out perfect.
