I got a good deal on a Mossberg 835 Ulti-Mag. Turkey/Deer Combo. I am curious as to what 3 1/2" slug to try first. Actually, I am also wondering what benefit 3 1/2" slugs would give me. Needless to say that finding 3 1/2" slugs is a chore in itself. Any one got any advice or experience with this? I would like to try this thing out Thanksgiving morning, so I can possibly us it on Saturday.(Opening day of shotgun!!!!!)