I see 2 things here. Have you tried pushing a bullet down a regular barrel? I'll bet you can't.
Now, a properly pressured shotgun round makes MUCH less pressure. I think, but don't know if you can push it down the barrel, or how much force is ok?
Also, I would guess a plastic sabot is in the design, because it is hard to blow yourself up with such soft bullet materials!
Last, I would call Slug R Us. They are the only ones who really know their load.
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