you actually need to make sure you are using a swirl/turbo tip for mapp gas, if you use a standard propane torch head, you can melt it down inside, and they come apart spectacularly
I found that out the hard way, if I hadn't been wearing welding gloves at the time, I would have had a world of pain, as it was, I just singed some arm hair
oh yeah, and if you're looking at small hardware stores (not menards, homeless depot, or lowes), try to find some old bottles of actual MAPP, the MAPP/PRO is a propylene blend and doesn't burn as hot,
acetylene burns at 5900* with oxy, real MAPP burns at 5300* with oxy, MAPP/PRO burns around 5100* with oxy, propane burns about 4500* with oxy
those are neutral flame temps, a lightly oxidizing flame adds 100-200 degrees, when I'm cutting with the oxy/mapp I don't **** around with "lightly oxidizing", I'll get her going wide open to the point it almost sounds like I have the big torch going and the metal is popping and throwing sparks
the biggest reason you're going to go much slower with the oxy/mapp (and especially the new mapp/pro) than your big torch is the gas flame velocity, acetylene gives about 1350 ft/sec, mapp gives about 925 ft/sec, and propylene is only 750 ft/sec