| Subject: Re: Headspace (again) |
Author:
Pete J.
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Date Posted: 09:42:00 06/26/09 Fri
>>On full-length resized ammo, "head space" measurement
>>is almost irrelevant, (unless your firearm has a
>>headspace issue, or you believe the dies being used to
>>resize this brass may be worn out of tolerance). SAMMI
>>specifies die tolerances, and a full length-sizing die
>>typically returns brass to "minimum chamber size". If
>>factory ammo has no headspace issues in your rifle,
>>full length resized ammo (from a die within SAMMI
>>speck) shouldn’t either. (Different factory dies size
>>differently but all within the "TOLERANCE" specified.)
>>Buy and READ "Hatcher’s Notebook" by Julian S.
>>Hatcher, published by Stackpole Books, to learn that
>>there is excessive misinformation and needless
>>concerns about "Headspace" in properly assembled (or
>>manufactured) fire arms. IN SHORT, properly resized
>>brass will function no differently than NEW brass.
>>
>>(Are you questioning the machinery, technique, or
>>skill of the folks here?)
>>
>>
>>I asked the question awhile ago. Now I'll ask again in
>>>a different way. Has anyone who has received rifle
>>>brass .223/5.56 .308/7.62 checked the brass for
>proper
>>>head space with a precision mic or a Wilson cartrige
>>>case gage? And what did you find? I have not yet seen
>>>a post mentioning this or anyone asking this
>question.
>>>If you are a reloader this is important. This is the
>>>only question that so far has kept me from ordering.
>I
>>>think it a great thing to knock off most of the work
>>>involved in processing brass. Not trim length but
>head
>>>space. BTW congrats on the DOD reversal. Dean
>
>No. I am not questioning the machinery, technique, or
>the skill of the folks. I am simply asking whether or
>not anyone here has measured any of the cases sent to
>them with any of the case gages available to
>reloaders. I just want to know if they bump the
>shoulder back to new case dimensions or min. sammi
>specs. Which is usually .003 - .004" short of most in
>spec chambers so there is no "out of battery" issues
>with some semi autos. Simple question easily answered.
>Case gages can also be verified for accuracy with
>"new" ammo. No, not just one but from different mfgs.
>and they are usually fairly close. The question has
>been here on the message board for a long time. All
>scharch would have to do is tell me if they use min
>sammi or not.
>Don't you check your cases for headspace? Your calling
>headspace measurement "irrelevant" concerns me in as
>much as you shooting reloaded and resized ammo in your
>rifle that you don't even know if the HS is correct,
>if you did you wouldn't be asking me what my motives
>are. My motive should be obvious to you and anyone
>reading this or my other two posts. It's called
>safety. There may not be an issue with the rifle but
>there surely could be an issue with cases HS too much
>or not enough. And if you shoot a semi auto service
>rifle it is essential. This is common everyday stuff
>for those of us that shoot service rifle in matches.
>Dean
Dean
READ General Hatchers book (which I mentioned in my first post). He was chief of ordinance for the army for many years. He gives a phenomenal detailed account of every ’03 rifle failure since the adoption of the weapon for U.S. Army. He devotes an entire chapter to headspace and the misinformation currently circulating, and he even suggests where and why this misinformation has taken hold and why even “good, and knowledgeable” gunsmiths perpetuate it. I understand and commend your adherence to safe reloading and shooting practices; the actual meaning of your original question still eludes me though. If you accept full length resizing as an acceptable method of reconditioning brass for reloading, and you accept the skill and equipment used, and the probability that in today’s litigious environment only accepted practices would be utilized by someone in business of reconditioning and providing to the public a product used in ammunition remanufacturing, buy a small quantity of their product, and evaluate them to whatever standard you feel is necessary. I am surprised you would take a strangers word on the results they obtained, (in evaluating their purchased brass) if you question the quality control of the re-manufacturer.
Pete
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