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June 15, 2019, 04:07 PM | #26 |
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Win brass is lighter and thinner, but do not believe it is weaker. Also believe the starting dia at the largest dia of the case body is about .0005 -.001 less in dia, and at the pressure ring is smaller yet.
From older brass and using stoney point 400 collar, but did not do a statistically relevant evaluation and did not subtract collar depth. Win = 3.622 Fed = 3.618 Rem = 3.620 Have never stoned out a rifle chamber, but would be interesting to see if it increases chamber dia measurably. Would also be interesting to know make/model. 308 ar-10's can be picky, and have some with looser chambers, and some with tighter chambers that require sb dies. Some manufacturers may choose reliability over target purposes. Am not in habit of using hunting loads in my ar's, but that is just an opinion. |
June 16, 2019, 08:19 AM | #27 |
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The bolt is supposed to be stripped before you try the go or no-go gauge. A good chamber should not allow a no-go gauge to close on it. If it does close (and the bolt is stripped), then the reamer went in too deep.
Second, it sound like the chamber wasn't polished after reaming.
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June 16, 2019, 09:07 AM | #28 | |
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Quote:
F. Guffey Someone should suggest the OP take the rife apart to inspect components. |
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June 16, 2019, 09:36 AM | #29 | |
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Quote:
And then there was the 03; the 03 barrel has an extractor cut. I like the extractor cut because the extractor cut allows for more case head support but on thin case heads with heavy loads the extractor cut allows for the unsupported case head on the extractor cut side blow out. Back to reloaders and their world evolving around case volume: I said I prefer cases with thick case heads when firing rifles in unknow condition. And then there were reloaders that claimed some 03 chambers had a lot of unsupported case head and they decided that was OK. I did not agree. My 03s have .090" case head protrusion from the bottom of the extractor cut to the case head meaning the 03 has more case head support than the 98 Mauser. Difference between them and me? I know when the case blows out on the side of the case head the rifle has a very serious problem; I will not assume anyone knows and or understands, and then there are those that spend most of their time insisting the case has head space. A more adult thing to do is to check the chamber for unsupported case head and then there is case head protrusion. My 98s have .110" + case head clearance. And then there is the case, most of my 8mm ammo if formed from 30/06 military cases. For those that believe the only thing a case has is volume my military cases have a case head thickness of .200" from the cup above the web to the case head. And if I choose to thicken the case head by .060" I can do that but I would not think of firing a rifle without checking 'the gap between the end of the barrel and bolt face or as one of use refers to the gap as unsupported case head. F. Guffey |
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June 16, 2019, 10:56 AM | #30 | |
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Quote:
The fact this was a brand new upper , I did not want it to look like I tinkered with the BCG just in case it had to go back and void my warranty or have any questions about what I did to cause any problem that may have come up . In this case that was a good choice . In most cases stripping a bolt is not that hard but the AR bolt needs 3 to 4 hands to do so .
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June 16, 2019, 01:37 PM | #31 | |
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Quote:
F. Guffey |
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June 16, 2019, 08:33 PM | #32 | |
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Metal_god:
Quote:
I believe what is important in this thread is first your ejected cases should not look like those pictured additionally and more important is the numbers you got on the spent cases. The first symptom points to a poorly finished chamber, never polished. The second symptom points to excessive headspace and honestly with what you have I doubt measuring with a fully stripped bolt would make any difference.Based on your numbers and measurements the best thing you can do is arrange to return the rifle to manufacturer. Let them deal with it based on your complaints. I figure when you plop down bucks for a new rifle you should expect a quality functioning rifle. My experience is that sometimes even a bad rifle makes its way out of a company known for good refiles and quality. Early on in the thread you confirmed what you pretty much already knew. I wouldn't screw with the gun or put any marks reflecting anything you did. Ron |
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June 17, 2019, 08:41 AM | #33 | |
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Quote:
F. Guffey |
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June 17, 2019, 09:59 AM | #34 | |
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Mr. Guffey:
As long as you quoted me, I do not see a connection between Bart B's comments in another thread and the main topic of discussion in this thread? Quote:
The symptoms make it clear there is a problem which should be addressed and since the rifle is new I see a return to the manufacturer as a viable solution to the problem(s). What Bart B chooses to believe or disbelieve in another thread about a different topic is here nor there in this thread. Ron |
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June 17, 2019, 10:28 AM | #35 | ||
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Quote:
Quote:
In the ops next picture he has a case head with a split case head . The OP is flirting with some dangerous stuff and he is needs help from someone that cares. I could form cases that would off set the distance from the shoulder of the chamber to the bolt face; problem, off setting the length of the chamber with a formed case will not correct case head protrusion/unsupported case head. F. Guffey |
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June 17, 2019, 03:43 PM | #36 |
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OK, everyone has had their say.
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