buckenbass,
I did one similar for my brother but I made it a permanent barrel by silver-soldering it together after threading it together. He had ordered a .357 maximum barrel just before the fire at Thompson - I had a spare short barrel and he bought a 35 caliber rifle barrel. Not a tough job - and it shot better than the 357 custom barrel that he got from TC. I think the faster twist gave him better accuracy even with the 158 grain bullets that he uses.
PaulS