The local gunsmith here uses a 55 gallon drum filled with water. He welded a steel neck about 2 feet in length and about 6 inches in diameter to fire into. Kind of like what the forensic specialist use when they want to match a bullet to the rifling.
He also welded a thick steel plate to the bottom of the barrel just to make sure that the bullet doesnt pierce the bottom. The way he made the neck on top, it actually muffles the sound quite a bit as well. Put some insulation around it and it works perfectly.
He also welded a thick steel plate to the bottom of the barrel just to make sure that the bullet doesnt pierce the bottom. The way he made the neck on top, it actually muffles the sound quite a bit as well. Put some insulation around it and it works perfectly.

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