Sounds like just a good semi 12g is gonna cover a lot of bases for you. Sounds like the budget is on the lower end, that you just want something you can grab and give it a try. You want to shoot Sporting Clays, and maybe 3gun, and at some point will want to try skeet and trap. Someday you might end up hunting birds.
Now the tricky part is there is so much out there and so much of it is good that it makes deciding tough. I would think just a basic 11-87 gives you a lot of options. Extra barrels are cheap, it would be cheap and easy to toggle between clays and 3gun. And if you want something else there are more people that would be in the market for a used one than some others.
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