RE: extremely HOTT!!! barrel on a 30-30?
I'm no expert, but do know a little about metal. Maybe it's the grade of metal or has to do with pressures. The 30/30 is an old cartridge and many old guns were made for low pressures, under 30,000psi.
I would have to check with others though. James B, BigBulls and Big Country are some good gun guys for info. I'm a flatlander who loves rifles and shooting them.