Quote:
Quote:
Barrel shank length = (Distance from Inner Collar to Receiver face) - .002" (for crush depth).
The same way I calculate it too.
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If the shank length is shorter than collar-to-face distance, the shoulder would contact the receiver face first and shoulder would be the main contact point instead of inner collar. Should it be +0.002" instead of -0.002" if sitting on Inner Collar is more desirable.
For Mauser's 12 TPI thread, barrel turns 360 degrees per 1/12" advance, or 360x12 degrees per inch advance of thread.
0.002" = 0.002X360x12=8.64 degrees turn from hand tight (barrel touches inner collar). Does not take much torque to apply 8.64 degrees, I guess maybe no more than 40 ft-lbs. So, the shoulder will be pressed hard against receiver face as well when a typical 80 ft-lb is applied to install a barrel.