Re the locking bolt and barrels to action fitting, there is an assumption, fostered by generations of gun writers, that the only phenomena at work are the rearward thrust of the cartridge on the action face.
Known factors such as the friction component of cartridge in the chamber, the radial expansion and axial contraction of thick walled cylinders and others, are overlooked, at least I have not come across any mention of them in the known "authorities".
The situation brings to mind the theories re ulcers being caused by stress, untill two doctors discovered that a simple microbe and not stress was the cause.
Last edited by Shotgunlover; 10/23/16 06:30 AM.