As per Kenmi the spring energy to the primer is decreased when the bolt is not fully closed. You can duplicate the same thing using practically any bolt action rifle.
The other thing to consider is that you do not want the cartridge the fire with the bolt only partially closed - consequences could be diastrous. It doesn't seem to be as much a rifle problem as it is a user error.

drover

223 Rem, my favorite cartridge - you can't argue with truckloads of dead PD's and gophers.

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