When I loaded for my 16 gauge bp using plastic hulls I sealed the overshot wad in place with a run of PVA glue around the outer edges of the wad.
The PVA is normally not suitable for gluing the plastic used in shotgun hulls but I never had a wad come loose.
Good test was after firing just one barrel with a side by side, all the shot didn't run out of the second barrel when the gun was lowered due to the wad being disloded. Seen thus happen to other shooters.
Don't think the PVA would be suitable with brass hulls though.
Back in the day they roll crimped over the overshot wad with the original cardboard type hulls.
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