I think most people are going to recommend either the remington 870 or mossberg 500 series (I don't know the specific model). Both offer deals where you buy one gun and get a package with two different barrels. The 870 usually comes with a 28" and a 20" barrel and the mossberg usually comes with a 28" and an 18" barrel. For turkey I would reccomend the 870 12 gauge 3 1/2" magnum and then buy a shorter slug barrel with open sights for the coyote and home defense purpose. You can choose between the smooth bore slug barrel or rifled dear barrel. Both are 20" I believe. This will give you a lot of versatility. The price may be a little over $300 but it will be close.