Re: Question about rifle barrels.
No harm done. MAchine gun barrels sometimes run til they are red hot. then reloaded and ran some more. thier accurate service life is in the thousands of rounds.. The WW2 german MG42 AKA Hitlers Buzzsaw had a barrel service life of about 5 minutes before it had to be changed, but its rate of fire was 1200 rounds per minute, hence the moniker the Buzzsaw. It was designed so the MG crew could change the barrel as quickly as the link of 8mm ammo it fired.
Point is the heat of sustained fire doesnt harm the barrel permanently. if allowed to cool periodically it will have zero effect at all aside from burning your hand if you touch it.
Some rifle string when they heat up, this is an indication that you have stress on the barrel somewhere either stock touching or a stress within the barrel itself. could be mated to the action out of alignment, maybe it wasnt stress relieved at the factory, there are many variables. Just learn the limits of your rifle and shoot within them..
It takes 43 muscles to frown, 17 to smile, and 3 for proper trigger squeeze.
The latest caliber or gear is no substitute for experience and skill. Rifles and cartridges don't make hits -- shooters do.
Fact of life:
After Monday and Tuesday, even the calendar says WTF!