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Stretch marks ? Updated results (Read 1275 times)

oughtsix Global Moderator ASSRA Board Member Offline Posts: 1260 Location: Columbus Joined: May 31^st, 2009	Stretch marks ? Updated results Aug 25^th, 2023 at 5:16pm	Print Post
	Recently took ownership of a 44S #1 Rolling block. A box of converted 348 brass came with it. I am reasonably sure the brass was not fired in the rifle. and on inspection, they all had ringlike marks near the rim and a stretch mark a bit further up. I don't have anything like this on my other 348 converted to .44-77 brass. I am wondering if this is safe to shoot. Hope the picture shows the marks
	« Last Edit: Jul 15^th, 2024 at 9:43pm by oughtsix »
	Life Member ASSRA, OGCA & TSGC I'm all in favor of keeping dangerous weapons out the hands of fools. Let's start with typewriters........ Frank Lloyd Wright
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frnkeore Frequent Elocutionist Offline Posts: 7234 Location: Central Point, OR 97502 Joined: Jun 16^th, 2010	Re: Stretch marks ? Reply #1 - Aug 25^th, 2023 at 5:27pm	Print Post
	That looks like a bad chamber to me! Stretch marks on a RB are only on one side of the case.

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Cbashooter Frequent Elocutionist Offline Posts: 1567 Location: Eastern Wa. Joined: Mar 31^st, 2018	Re: Stretch marks ? Reply #2 - Aug 25^th, 2023 at 6:28pm	Print Post
	I had an 8.15x46R that the back of the chamber had similar marks from somebody using a drill to try get out a separated case.The case neck was still in the chamber when I got it so luckily the throat was fine.Brass looked just like yours.


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oughtsix Global Moderator ASSRA Board Member Offline Posts: 1260 Location: Columbus Joined: May 31^st, 2009	Re: Stretch marks ? Reply #3 - Aug 25^th, 2023 at 10:08pm	Print Post
	So a chamber cast does not show anything but a smooth chamber. All 20 pieces of brass have the marks that go all around the case. some of them have a slight but noticeable smaller diameter at the rim, like it has been pulled. the shoulders of the brass do not line up with the chamber cast, that's why I don't think they were ever fired in this rifle. Once again, are they safe?

	Life Member ASSRA, OGCA & TSGC I'm all in favor of keeping dangerous weapons out the hands of fools. Let's start with typewriters........ Frank Lloyd Wright
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marlinguy Frequent Elocutionist Offline Ballards may be weaker, but they sure are neater! Posts: 15971 Location: Oregon Joined: Feb 2^nd, 2009	Re: Stretch marks ? Reply #4 - Aug 25^th, 2023 at 11:14pm	Print Post
	I think they should be safe. But I'd polish the area smooth by spinning them, and using emery paper to smooth those lines off. If left the case life will likely be reduced, and may eventually get head separations at those lines. I've removed them before and gotten good life out of cases like these once I smoothed them. I just turned a steel rod to fit the case neck closely, and then chucked them in my drill press by the neck. Used a fine file to knock the ridges off, and then 320 grit to polish them.

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notlwonk Full Member Offline Posts: 159 Location: Coventry CT Joined: Dec 18^th, 2006	Re: Stretch marks ? Reply #5 - Aug 26^th, 2023 at 8:22am	Print Post
	They don't look like stretch marks, looks more like they've been filed. Those marks go right up to the rim and that's where the web is. The only stretch marks I've seen are ahead of the web and are much shorter and the surface 'texture' is completely different from what I see in the photo. You can make a tool to feel the inside of the case to check for stretch. A piece of heavy piano wire with the end bent 90* works well.
	« Last Edit: Aug 26^th, 2023 at 8:35am by notlwonk »

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kensmachine Oldtimer Offline Posts: 562 Joined: Nov 21^st, 2012	Re: Stretch marks ? Reply #6 - Aug 26^th, 2023 at 8:55am	Print Post
	to make 348 work in 44-77 you need to turn the base down this looks like a poor turning job to me ken


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Bent_Ramrod Frequent Elocutionist Offline Posts: 1451 Location: Southern Arizona Joined: Feb 8^th, 2006	Re: Stretch marks ? Reply #7 - Aug 26^th, 2023 at 4:08pm	Print Post
	A stretch mark on the outside is typically a narrow circumferential band of what looks like shiny crystallization maybe 3/16" from the base the shell. If you want to make sure, straighten a paper clip and with pliers bend about 1/8" of one end 90 degrees to the rest of it. Insert this into the case mouth and rub it against the inside case wall, up and down around the circumference of the inside of the shell. If you feel a groove or dent down there, it's stretching. If not, you are good to go on using the shell.


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boats Frequent Elocutionist Offline Posts: 7522 Location: Virginia Joined: Apr 23^rd, 2004	Re: Stretch marks ? Reply #8 - Aug 26^th, 2023 at 6:24pm	Print Post
	My guess base has been turned to fit the chamber using a less than ideal method. Many adapted cases need to be relieved at the web. It’s solid brass and will not size. I also use the hook scraping inside method to see if separation is developing Thing I like to do figuring out case fits paint it with a black sharpie. Tight fit scrapes it off & gives a clue what’s going on. All this pontificating, without seeing the job in person. Boats
	« Last Edit: Aug 26^th, 2023 at 8:02pm by boats »

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MikeK Participating Member Offline Posts: 34 Location: Northern Virginia Joined: Jul 21^st, 2018	Re: Stretch marks ? Reply #9 - Aug 27^th, 2023 at 8:06pm	Print Post
	Bent_Ramrod wrote on Aug 26^th, 2023 at 4:08pm: A stretch mark on the outside is typically a narrow circumferential band of what looks like shiny crystallization maybe 3/16" from the base the shell. If you want to make sure, straighten a paper clip and with pliers bend about 1/8" of one end 90 degrees to the rest of it. Insert this into the case mouth and rub it against the inside case wall, up and down around the circumference of the inside of the shell. If you feel a groove or dent down there, it's stretching. If not, you are good to go on using the shell. This!


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oughtsix Global Moderator ASSRA Board Member Offline Posts: 1260 Location: Columbus Joined: May 31^st, 2009	Re: Stretch marks ? Updated results Reply #10 - Jul 15^th, 2024 at 3:03pm	Print Post
	Here's what two of the three stretch marked cases look like with my black powder load. If I had been really smart, there would not have been a second shot. The first and third had these splits around the base. The other 17 pieces of brass went into the trash. the only good ( funny) part of this was that when all the onlookers saw the brass, they all wandered off and watched from a distance

	Life Member ASSRA, OGCA & TSGC I'm all in favor of keeping dangerous weapons out the hands of fools. Let's start with typewriters........ Frank Lloyd Wright
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rgchristensen Frequent Elocutionist Offline Posts: 1080 Joined: Jan 2^nd, 2014	Re: Stretch marks ? Reply #11 - Jul 15^th, 2024 at 5:17pm	Print Post
	kensmachine wrote on Aug 26^th, 2023 at 8:55am: to make 348 work in 44-77 you need to turn the base down this looks like a poor turning job to me ken I’m sure this is the explanation of the markings. The 348’s need to have the base diameter reduced to work in that chamber. If they are turned down too much, that may account for the burst cartridge case. CHRIS


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oughtsix Global Moderator ASSRA Board Member Offline Posts: 1260 Location: Columbus Joined: May 31^st, 2009	Re: Stretch marks ? Updated results Reply #12 - Jul 15^th, 2024 at 9:44pm	Print Post
	Back to hunt for more brass …….

	Life Member ASSRA, OGCA & TSGC I'm all in favor of keeping dangerous weapons out the hands of fools. Let's start with typewriters........ Frank Lloyd Wright
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jhm Frequent Elocutionist Offline Posts: 1381 Location: georgia Joined: Sep 4^th, 2011	Re: Stretch marks ? Updated results Reply #13 - Jul 15^th, 2024 at 10:36pm	Print Post
	Like the food business. When in doubt throw it out... Piece of mind is worth far more than the price of new brass. JMH


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