I wouldn't use steel wool at all. I bet there is a vent hole under the handguard, meaning the area between the barrels will always be exposed to air and moisture. The steel wool will rust quickly and start rust everywhere else. Plus, it will burn if the soldering flame gets to it. Soldering double barrels takes a fine touch. To be honest, I would find a cowboy gunsmith and send the barrels to him, then get the end nicely engraved. 10 guage doubles are not common and will keep the value if finished nicely. The epoxy would be my second choice. Whatever you do, add a drop or two of oil in the mentioned vent hole and let the barrels stand muzzle-down overnight. This will prevent rust, from the degreasing of the barrel in prep for the solder or epoxy.
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