I've used propane for oxyfuel for years. no worries. good torch and mixing valve key. I use smith and swear by it. sc110 is 300000btu heating tip for heavy duty cutting torch. I've hand cut 5" thick with sc50-6 pretty smoothly. with sc40-00 have done sheet metal with same torch. with in tip mix valve can swap tip to run acetylene or mapp(or whatever it is now) cleanly without issue. with gouging tips I've gouged a lot as well as having used regular cutting tips for gouging. sc50 heavy preheats can be really handy, and sc40 std preheats are also great. also very efficient. the tuf tony, the predecessor to current heaviest duty cutting torch, is crazy strong and durable and efficient/smooth with very little pressure drop through torch. use 3/8" hose for the sc110 or #6 tip it makes a real difference.
