@ post #13...
ANY rifle, any caliber is capable of overheating the barrel.
"Blasting away", or rapid fire in long strings, is very infrequently done.
Even battle and assault rifles designed with full auto variants cannot withstand that type of punishment for long. That's why you'll see that weapons that are designed for the punishment (like the M249) of full auto also come with quick change-out barrels. A minute or two, and they're done...
If you're shooting for accuracy, it is important not to overheat the barrel as it will string the shots and affect accuracy.
If you want to send a bunch of lead downrange, I'd suggest an AK-47...
If you want to punch paper, .223...
Now if you want to add hunting to the mix, that's gonna depend on the game your're talking about...