A question on barrel heating

cam1936

cam1936

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I've done a search and learned a few things, but haven't quite found what I'm looking for. My question on barrel heating is what sort of cartridge heats up a barrel faster? Does it have to do with the total amount of powder burned, or does it have to do with how over-bore a certain cartridge is.

For example, will a .243 Win heat up a barrel faster than a .308 Win (all other factors being equal)? They each burn similar amounts of powder, but the .243 is obviously more over-bore.

Or does it have nothing to do with the amount of powder being burnt for a given bore diameter and everything to do with how much powder is burnt total? Will a 35 Whelen heat up a barrel faster than a .243 because it’s burning more powder (all other factors being equal) despite being somewhat under-bore?
 
It's a good question. Springfield Armory did a test of this question and concluded that it was primarily due to burning gases, with the balance being due to friction. I have since read in a study I read on-line (but cannot quote the source) that with the advent of complex strain gauge measurements that, Yes, Barrel heat is the result of a combination of combustion and friction, but heat is also built up as a result of pressure.

Taking steel from 0 PSI to 60,000 PSI in under a millisecond heats up the barrel very fast.

Heavy barrels tend to resist the build up of heat better, but dissipate it slower. Volume of powder also affects heat as well

Machine guns using low-pressure 5.56 or 7.62 ammo do get very hot, but if you could make a 6PPC or a 6BR machine gun, I expect it would burn out a barrel far faster.
 
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