RE: What Loads would be best for turkey hunting?
Well, you will need to hit the range and try some differn't loads to see what works best in your gun and choke. I'm shooting a Mossberg 500 also, and use Federal Premium 3" #5's. I have tried about 15 differn't turkey load combo's plus 4 chokes to find my "perfect" setup.
If you have a friend or releative, or several for that matter, it helps for you all to share differn't loads. My friend and I will buy about 3-4 boxes apeice of differn't loads and then share to pattern. Since you have a Mossberg 500 you can also borrow differn't chokes with people who use Winchesters and some Brownings.
Good Luck.