That just reminded me of the old .410 mossberg pump my great grandpa had. The barrel looked almost identically thick as my 1917 wichester 30-06. Makes me wonder if you could cycle/fire 45 long colt in it. Now that would be a cool woods toy:Get a chamber adapter to convert your shotgun to 22 LR. Learn to index it so you can actually hit stuff consistently. CCI CB Longs are almost silent and hit hard enough for small game at short range. You need to fashion a rear sight you can stick on with tape or a magnet.
My INCH cart has a pistol gripped Remington 870 Express 3" mag 12 gauge cut to 20" with screw in chokes and an extended magazine. . I put a mid bead in the rib to serve as the rear sight The sling carries 10 rounds. My favorite camp defender load is 41 pellets of #4 buckshot or 18 pellets of OO. My cast Lyman 1.25 oz. sabot slugs are good enough to hit 3# coffee cans at 90 yards.
If you learn to reload you can make nice small game rounds for almost are gun with cast bullets. 45-70, 450 Marlin, 458 Win etc. can be loaded with shot to be 410 like.