I've seen several postings recently on the fringe gun boards about making home defense slugs by loading regular shot loads and sealing the case with melted parafin. Gives me a little pause about usig overshot wads and sealing with a thin liquid glue/cement/waterproofing. Test targets I have seen show they do just what you show, exept there are few individual shot, due to the entire shot load being saturated. They are supposed to fragment on a wall and not go through two or three.
I have also seen mention that this can happen if you use a thick cushion wad.THe first layers of shot can be impressed into it with a heavy load or high wad pressure. A lot of people recomend an overshot wad over the cushion wad for that reason.
If you are sealing/cementing the overshot wad, it may have been a lump of shot from the top of the shot string rather than a wad.
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