I would recommend any one the same three shotguns I have:
Winchester Model 12 Pump - No. 3 on the Field & Stream "50 Best Guns Ever Made"
It is well known among the snobbier of shotgun enthusiasts that no repeating shotgun can handle as well as an over/under or a side-by-side. But there is one repeater that points like the Finger of Doom itself, the Model 12 pump. Introduced in 1914, the Model 12 lasted until 1976, when production costs drove it out of the Winchester lineup. It came in every shape and form-"from field models to riot guns to heavy waterfowl models-"and in all gauges, but it was as a competition gun that the Model 12 was perhaps most dominant. For decade after decade, if you did not shoot trap and skeet with a Model 12, you were an odd fellow. The Model 12 seemed to lock on a target and stay there, and you could not wear it out. Serious shooters would put several hundred thousand rounds through their guns, have some minor rebuilding done, and repeat the process. I've handled one Model 12 trap gun that had had a million shells shucked through it, and it was in much better health than its owner. And it shot fast. Well-broken-in Model 12s had a slickety-slack smoothness that let you shoot them as quickly as an auto. Winchester's great exhibition shooter Herb Parsons used to hold five clay targets in his left hand, throw them into the air, and break them all before they hit the ground, pumping his Model 12 faster than the eye could follow. The Model 12 has faded now, overshadowed by more modern guns, but in its time it was the repeater-"indeed, the shotgun-"against which all others were measured.
Remington 1100 Semiauto - No. 4 on the Field & Stream "50 Best Guns Ever Made"
Autoloading shotguns had been around for a long time by 1963, but the new Model 1100 was different. Previous self-loaders were heavy and handled like sledgehammers. If they were recoil operated, they kicked like mules. People tolerated them only because they offered three or more fast shots. The 1100, on the other hand, was sleek, moderate in weight, and handled splendidly. Most important, it had softened recoil. Its gas-operated action spread the rearward thrust of the gun over a long period of time and took the sting out of shooting. Trap and skeet competitors bought 1100s by the carload. New shooters, and people who otherwise would not be shooters, took to the 1100 as the one gun that would not beat the daylights out of them. The 1100 was not perfect. It would jam if you didn't keep its gas system clean, and it wouldn't digest every kind of shell you fed it. Once you really began to pour the rounds through, an 1100 would break, but it was easy to fix. Not a "fine" gun like the Model 12, no marvel of fit and finish, the 1100 made extensive use of stamped parts. But it was, and is, a revolutionary gun.
Reminton 870 Wingmaster Pump - No. 10 on the Field & Stream "50 Best Guns Ever Made"
Think of it as a Winchester Model 12 that is easy to manufacture. The Model 870 made its debut in 1950 as one of the first of Remington's "new generation" of guns that did away with the complex machining of the past. And it may be sacrilege to say so, but the plebian 870 is probably as good a gun as the aristocratic Model 12. It pumps just as fast, points as well, is just as reliable, and is unbelievably long-lived. The late shotgunning great Rudy Etchen put 4 million rounds through his 870 with just some minor parts replacement to keep it going. The 870 is still with us, made in every configuration known to man, and it will probably be around for many years more.