#21
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Primers backing out a thou or so when firing factory ammo in an AI chamber maybe shouldn't happen but I have seen it happen a lot, and in quite a few different guns. As long as you don't bump the shoulder back on the next sizing, either only neck size or properly adjust the FL die, those brass with the backed off primer work just fine from there on out. KB Your subsequent shooting results would indicate the Hornady ammo is short. It would probably lift primers even further in a 243 if your AI chamber is correctly cut.. |
#22
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#23
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Daryl |
#24
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I think the datum line, with is the shoulder location for headspace measurement on all standard cases, is supposed to be .375" on the shoulder. This should be easily produced with a ctg. or tube having exactly a .375" ID.
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Daryl |
#25
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For what its worth Ken when I worked in a gunshop a couple of customers came in with faulty "super performance" ammo. One I recall was 7mm rem mag and the primers had backed out and in one round ruptured. Quite why you would carry on firing after getting results like that escapes me, but he assured me he had never had problems with other factory fodder. I must admit I don't use the stuff as it seems to me to be pushing the envelope.
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#26
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Primers do not back out due to excessive pressure, but due to excessive headspace coupled with low to moderate pressure. with low to low-moderate pressure, there is not enough pressure to stretch the case (at the web) and re-seat the primer against the bolt face.
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Daryl |
#27
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I don't argue with your logic above at all. It simply shows that a lot or rifles, regular chamber or AI, are cut long for head space. But if I pay to have a rifle AI'd, I hope the smith is smart enough to do it right so I don't have to go to special steps just to make it all work. Ackley's concept has always called for a crush fit on factory ammo that can be verified by a head space gauge and not a box or two of ammunition and a neck sizing die after the gun is "finished" and in the customer's hands. If I'm going to get a rifle AI'd and I pay good money to have it done, I'm not going to use a smith that can't get it right and live with his ineptness like a lot of people do. Those smiths aren't worth walking through their door with a job you want done, and unfortunately there are a lot of them out there. And with the information now supplied by the Op, I agree that the problem is likely faulty ammunition. That's why I recommended a different ammo brand. Other solutions that have been offered work too to determine if this is the problem, but firing live ammo is the bottom line anyway so why not use it........ One or two rounds fired will give a quick answer. -BCB
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I miss mean Tweets, competence, and $1.79 per gallon gasoline. Yo no creo en santos que orinan. Women and cats will do as they please. Men and dogs should relax and just get used to the idea. Going keyboard postal over something that you read on the internet is like seeing a pile of dog crap on the sidewalk and choosing to step in it rather than stepping around it. If You're Afraid To Offend, You Can't Be Honest - Thomas Paine Last edited by Bayou City Boy; 08-24-2015 at 05:21 PM. |
#28
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I further agree that more people should be sending back poor work and making darn sure it is done right. Should also stop using bad smiths but the problem is there is a very high demand for gunsmith work and so few places to get good accurate info on the quality of work a smith does, unless the smith is really famous. Unfortunately the really famous ones have prices and wait times that mean we often need to go looking for ones working their way up the success ladder. It is why I have found a couple of good ones and stick to them like glue. I have one that is about to retire so I will be on the hunt for another one to replace him. I hate trying out new smiths. |
#29
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Forgot to say, I also did as trotterlg suggested, and fire two Superformance rounds with just the primer in. The primers backed out 24 thou!
csterner, I might find something that will do, although I don't have a big selection of different cases. Thanks for the idea. Ken.
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" Pay it forward buddy" Get up each morning and don’t let the old man in. (Clint Eastwood). Last edited by kenbro; 08-24-2015 at 08:04 PM. Reason: Correction. |
#30
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Holy $hit Batman, .024 is really a lot!
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A gun is just like a parachute, if you really need one, nothing else will do. |
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