The barrel was severly bulged at the point of the dovetail and for all practical purposes ruined the rifle bore. 22 LR RF barrel(optic sight)with the dovetail empty. 22 LR rimfire upper barrel in to the shop because he had removed the rear sight from the rifle barrel dovetail and had fired the. A customer brought a Savage Model 24 O/U in. While the cartridge case mitigates this somewaht, I can best explain by citing an actual case example. 22 rimfire develops some fairly high pressures and is capable of blowing out any hole that is drilled to deeply. A vernier caliper can be used to determine the amount of material between the upper most surface of the reciever and the upper most surface of the chamber. That said, over the chamber, no more than half way thru the barrel. The rule of thumb is that you want the screw to engage by at least 4 threads.
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