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Old November 20, 2012, 07:01 AM   #17
1stmar
Senior Member
 
Join Date: March 21, 2012
Location: Connecticut
Posts: 1,208
I get what your driving at just not sure I agree. The rifle is not vertical it's horizontal with the rim supported by the bolt. The weight of the rim is significant, as are the dimensions of the rim, bolt face, the length of the chamber relative to the length of the cartridge, the length and dimension of the neck... When the firing pin strikes the primer, ignition starts, there is slop, so the case doesn't fill the chamber and press against the shoulder until some point of pressure build. This is when the case centers or tries to center itself in the chamber. If the bullet releases before the case is fully expanded it will not be as centered as it could be. If the case started against the shoulder and was pressed into the chamber I would agree with the analogy.
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