One trick I've used, not on shotguns but on furniture.
After mixing the epoxy and dust, the finer the better, apply the mixture onto the crack and use a vacuum on the other side to suck the mixture into the crack. I've used west systems epoxy, or any 5 min epoxy will work.
Another one is Gel super glue with the wood dust
Or you could try CA glue with activator. That I would mask off the area you are repairing.
There are different colors, so you can find the best match.
All the best,
Harry
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