Re: win 1300 slug gun
Think you will find each gun is unto its own, so I would not get too excited about what someone else's gun shoots.
Hint Hint, if two shots don't group, the 3rd will not tighten the group up!
I would recommend those, the Hornady SST and maybe the Lightfields in that order. I would shoot the 2 3/4. The 3" are slobber knockers for sure and not needed.
You will need a very strong mount and bases. Ballistics are comporable for all three and Federal has an online ballistics calculator that will work