Ron, years ago Mittermeir used to sell expandable bronze dent removers. These were available in 12,16, and 20 ga. One used them by expanding them to bore diameter, greasing the bore, and then driving them in to a place directly below the dent. A heavy wooden dowel was the most frequently used "driver", and it took some mallet work from the breech end to make them arrive at the right spot. A lead hammer or piece of very hard wood (today it is micarta)was then used externally to peen the dent out. Very simple. If you have the means to turn such a plug, I am sure it'll do the same job. Keep you eyes open at gun shows: the last time I saw a set of these, no one knew what they were. They sold for $5.00 for the set of three gauges. Chopper
