Hello. No I usually use our gas range stove theses days , I recently bought a better propane torch but it kept catching fire , I had bottles for oxy acetalean , argon for tig but gave them away as I was spending £400 a year renting I bought a bottle for mig welding but at £80 a refill I have gone back to stick welding On this job I had run out of decent etch flux, and it was rubbish what I had. I have soldered a number of ribs when i can get the the metal clean the other problem was these barrels were only held together with a putty stuff , and were moving . The top English makers often use pine resin as a flux. I got the barrel perfect for soldering but the rib had deep rust and although I ground much off the steel was still black, I chose epoxy rather than use a new steel rib . It’s the problem with derelict guns. Like the epoxy did not hold the stock together now I have three bits, a lot of the wood was soft and broke away and oils had soaked in ? So now I have been wood scraping in the hope of a good epoxy joint
I have done well on the heavily dented shot barrel so this is a minor problem. Getting on a bit now 81 in March , just a number ,
Nice to chat I wish you well