The firing pin is positioned in such a manner as to impact the edge of the chamber at the barrel face and damage that poit. One thing that is a NO-NO with any rimfire,like a 22, is dry firing. generally speaking.MY RULE is that if you have the bolt assy in your hand and you are checking any phase of the feed.fire and extract cycle.I like to have the extractor to support a loaded round against the bolt face.not so that you can snap the bolt and cartridge around and have it stay.just hold it there with relative security.When assembled.the idea is for the feed system to bring up the round.slip it under the extractor and do it with enough slop so that the bullet nose slips into the chamber without causing any binding of the mechanical process.Seldom will the case rest against the bolt face in a near perfect postion.centered or otherwise.if it feeds without binding or shaving of metal from the cartridge.bullet or case.then it is acceptable.The chamber has specific dimensions with calulated clearence numbers.oversized or undersized chambers can be problematic.with any firearm. 22 caliber repeater, regardlessof action style. As I understand your question.your saying that when the cartridge feeds up and under the extractor as it travels forward with the motion of the rides loosely against the bolt face.if this is it.there is no specific rule here.slop is necessary to allow feeding(often a major issue with any.
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