My brother and I built a carriage for a 75cal barrel that we bought from DGW in the 60's we wer 14 and 15 at the time and built it as a scout project and actually took it on scout trips and fired it. We also had a 69 cal ball mold and used 12ga shot capsules to fire the balls for accuracy. It never accidentally went off and we knew how devastating it could be with a ball as it went through a heavy zinc/steel trash can at 20yds during some test firing. Accidentally went off, just like all the accidents while cleaning loaded pistols!!!!!