There are some other forces taking place we are not considering.
As a cartridge is fired pressure increases forcing the brass case to expand and seal against the breach, the bullet then slams into the rifling, I think it is at this instant that the reverse force is being applied. Once the rifling breaks in this force will be reduced considerably. Basically I wonder if the smoothness of the forcing cone on a new barrel is the determining factor of barrel back out and then only at the extreme earlyness of barrel life?
Good Post Rich!!
Vern
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