Keeping the Grendel cool at the range

[Gusmeister]

I am a little confused (nothing new) here. There is no question that some barrels will shift their POA when they are hot. Pencil barrels do it more than bull barrels. Got that. But am I reading that a hot barrel erodes the barrel throat at the same rate as a cool or cooler barrel? LR55... is that what you are saying? Or is it a matter of degree that is a lot less than normally assumed? Or are you saying a chamber/barrel fan is not effective?

Thank you. Looking forward to responses.