When a guy thinks that most of us cannot hold our hand in 145 deg tap water for long, getting a barrel to 150 deg does not seem hot for steel. But I agree hot to touch a good place to stop. Face it though, we all go over that at times.Pac-Nor told me the following,
Getting a barrel hot (uncomfortable to touch) is accumlitive. Damage is done the first time, and worsens every time.
That is the rule I follow now. figure they know as well as anyone, I've been meaning to take my temp gun to the range with me, but always forget.
getting a barrel to 150 deg does not seem hot for steel
Just capturing your brass on ejection tells you the inside is quite a bit hotter, as they get warmer the more you fire. I think 125 a good place to stop, or sooner.But at a barrel temperature of 150° on the outside of a heavy barrel, what is the temperature in the bore just after firing?
For load development I try to keep the barrel from reaching much above 125°, but shooting in a prairie dog town with targets everywhere my self control isn't as good.
https://thefiringline.com/forums/showthread.php?t=510919Barrels change point of impact going from cold to hot because they bend. And they bend because they're not stress relieved correctly after rifling or they're fit to a receiver that's not got a squared up face and there's hard contact at one point around the barrel tenon shoulder
I have the same pump, very effective to cool down the barrel.I bought this recently. Another fella on here suggested it. Bought some clear tubing that fits the chamber of whatever your using. It blows a lot of air, is rechargeable, lasts a full hour before needing recharging. I have a power pack to charge this pump and my Labradar. High output air flow.
https://www.amazon.com/dp/B01L6TGGQA/?tag=accuratescom-20