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  #16  
Old 05-19-2017, 02:17 PM
karls42

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Quote:
Originally Posted by cjsdad View Post
Those don't look like OOB fired cases. The base of the cartridge is not ballooned like it would be if the case were not fully seated in the chamber. That looks like the bolt is opening too soon and tearing the base off the case. Dirty chamber or not, that should not happen. There are two ways to overcome that problem with a 10-22. Make the bolt heavier or use a stronger hammer spring. The leverage the hammer puts on the bolt is partly responsible forhttp://www.rimfirecentral.com/forums/search.php?searchid=19386049&pp=25&page=2 holding the bolt closed just a split second longer. It cannot compensate for a bolt that is not heavy enough but it can adjust the action timing slightly. Polishing the chamber and adding weight to the bolt was the correct way to resolve your issue. Another thing to look at if the problem comes back is to dull the point on your extractor a tiny bit. If the extractor is too sharp it can tear the case head off like yours did. The 10-22 extractor is only there to extract live rounds and to control the empty by holding on to it, not pull it out of the chamber.
exactly how does the bolt "open too soon and tear the head off the case"? its a blow back action - opened by the fired case pushing the bolt open. it pushes the bolt open and rides with it until the case rim hits the ejector. wouldn't polishing the chamber make things worse?? The case would have less grip on the polished chamber wall and fly out faster and easier.
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  #17  
Old Yesterday, 11:33 AM
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cjsdad
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Quote:
Originally Posted by karls42 View Post
exactly how does the bolt "open too soon and tear the head off the case"? its a blow back action - opened by the fired case pushing the bolt open. it pushes the bolt open and rides with it until the case rim hits the ejector. wouldn't polishing the chamber make things worse?? The case would have less grip on the polished chamber wall and fly out faster and easier.
When you pull the trigger it sets off a chain reaction. The firing pin ignites the powder, the expanding powder expands the cartridge case and forces the bullet down the barrel. All of that forward moving energy is also trying to push the case out of the chamber. If the case has expanded enough to lock itself into the chamber like it is supposed to, there can be enough energy to bulge the case head. That small push against the bolt is enough to get it moving while the case is still stuck. If the bolt is moving and the case is not, something has to give. If the extractor is sharp enough, it will grab into the soft brass and tear the head off the case. This all happens in milliseconds but when you are dealing with explosive forces, that is all it takes.
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