I'm no gunsmith, I use 24" and 36" pipe wrenches.
The gunsmith that is trying to remove the barrel has had problems with this one. He's called Nosler with questions for the last week or two, with no callbacks.
That's why I am asking here.
Some stubborn gunsmiths "THINK" you dont need heat
Some say just use a bigger cheater bar
I say that puts more stress on the action though
it sounds as though your Smith is trying to be careful and err on the side of caution before twisting up your action, which is a good sign.
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If its anything like a Rem 700, with loctite equiv to green 620 he needs to get it at least 500F
last I removed something like that similar
my temp gun read 650F and the mechanism came loose without too much trouble
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You might ask him if he is familiar with using a propane torch to get a Rem 700 loose
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Shop press and oak blocks to hold the action, or his barrel vise clamped between a shop press
then heat, presoaking the threads with ATF and dribble ATF in the threads as it heats and it should soak in like solder
then use maybe a 3 foot cheater bar
I've watched vids of guys using even a 6 foot cheater bar for old military actions but again
I would not want to stress an action with whatever torque is developed from 6 ft of pipe
the propane heat expands things and helps it come loose on top of softening the loctite
keep in mind heat does not make the loctite disappear or render it useless, only softens it
Last Rem 700 I removed a barrel, it budged at first and then the loctite resolidified as soon it got a little bit cool, and I dislocated my shoulder putting all my might into it, so tell him he may have to reapply heat if he gets it to at least crack off
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if that don't work then yeah, Nosler may be the only last avenue
or machine a groove cut in the barrel just in front of the tenon about .010", then it'll come off