As the other guys said, bottleneck cartridges and Winchester '66 or '73 clones for the least amount of blowby and crud in your rifles. All I shoot these days is .38-40 and .44-40. As for the scattergun, I have the Biakal Bounty Hunter II, both real hammers and hammerless, a Liberty II hammer gun, a couple of '97s and they all stay in the truck or gun cart while I shoot my new favorite, the TTN imported Chinese copy of the 1878 Colt. The "Colt's" hammers are closer together, as on the original, and with the springs now coming in them I can sweep both hammers back to full-cock at the same time with my weak thumb. It shoots to point of aim with both barrels and "mounts" to the shoulder better than any shotgun I have, including all my '97s. This is just MY experience, of course, but as the 3 clubs I belong to's "gun-runner" (Class 01 FFL), I've ordered 12 of these shotguns for members. (At about $380 out my door)