I don't believe that any normal 357 load would blow up a K frame 38 special cylinder made in the last 50 years or so if it was reamed to 357.
It has been done many times and not once in the years I have been on this forum has a 38 special cylinder that blew up after being reamed and firing 357 mags shown up. If they would we would have heard all about it many times over.
Think about it a few off kilter front sights show up and it is the topic of the day with guys worrying about sights that might be 1 degree off. Yet not one blown up 38 cylinder from firing 357s and more than a few of them had that done to them.
My question is why ream a 38 cylinder, when K frame 357 cylinders are easy to come by and trimming the barrel shank and adjusting the forcing cone is easy and it doesn't cost that much more for the tools and cylinder than it does a 357 reamer.
A 38 special K frame sporting a 357 cylinder and barrel
