A long time ago I watched a gunsmith use a bag of shot to bend a A5 barrel. Owner fell and bent the barrel to one side. All the smith did was slam the barrel across the bag of shot several times. Judged progress by eye and then when he was close checked the POI. If I recall he charged him $5.00 for the job. Long time ago as I said. The barrel would have cost about $60-100.00 to replace so the owner was happy.