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Bill postures an interesting idea. I've never seen it done that way. One way I have seen the issue addressed is the center of the bolt is slightly dished not effecting the height of the leading or trailing edges of the bolt which are what lock the cylinder. What this does is to only allow the trailing edge of the bolt to contact the lead so less metal is dragging across it. It also keeps a bolt that drops a little late from peening the inboard edge of the cylinder notch. This dishing only needs be a few thousandths deep.
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