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On original military Mauser bbls,there is no shoulder contacting the forward face of the receiver ring.
As this is a retro barreled rifle,you likely have a shoulder bearing on the front face of the receiver ring.
You can run a lathe parting tool about .020 ahead of the receiver ring into barrel,approx down to the minor dia of the thread.This will relieve any preload on the forward receiver ring.
One way to warm it up is dunk the receiver in a Presto Hot pot of peanut oil.
Then you can get everything over 300 deg with out hot spotting anything.A heat gun is another option.
If you get yourself a can of freeze spray,when you have everything hot,wrenches on,torque applied,no luck...try shooting freeze spray through the bore while you have full torque on the bbl.
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