RE: hevi 13
I think I have one shell left from a box (10 to a box)that I have had for a couple of seasons. If memory serves me right I took a few toms with them. The 3 inch shellloaded with 5 shot patterned pretty good out of a 21 inch barrelled Benelli using both a Kick's .660 and an Undertaker .675 choke.
I liked how they patterned but my confidence in them was tested when one of the shells was a dud that cost us a bird. The wad and shot barely cleared the barrel, as if there was no powder in the shell, just the primer providing propulsion. I don't believe these particular shells were ever exposed to severe moisture so I am not sure what the problems was.