I would buy used if you dont plan on hunting alot. All my guns were pre-owned and they work very well. Get yourself a cheap 30-06, or even a good cheap Mossberg 500. Not sure if buckshot is legal in your state or if you can use shotgun on private. But a decent shotgun with a 4x scope and a box of slugs or buckshot should do you well.
Abraham Lincoln made all men free, Samuel Colt made them equal.