As Parabola knows, I own and use a William Powell top lever, side hammer gun than began life as a .360 rook rifle, and was rechambered in the 1920s to .410, with a 2 1/2" chamber. At the same time they turned down the octagonal barrel to be round, making it a sweet little shotgun. Where the rear sight was has been neatly blanked off.
But as my interest was in shooting Rook rifles, I asked a late gunsmith friend to make me another barrel, chambered in .32-20. This is octagonal, hand filed from a round .308 target barrel. It shoots both barrels very well.
I also own a Midland double hammer gun that was originally a .410, but has been lined (by the same gunsmith) with two old SMLE barrels and also chambered for .32-20. The right barrel is more worn and delivers a subsonic bullet, whilst the left second barrel is just supersonic, hence boom, CRACK !
The joys of old guns...
HB
