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Posted: 6/13/2021 8:20:40 PM EDT
Just curious if anyone has had a batch of soft Lapua brass. I purchased 200 sp 6.5 c brass and on the third firing half of it is showing signs of stress at the web. Load is not hot as I test up higher and didn’t feel this load is pushing pressures at all. Load is 40.7 H4350 under a 139 Lapua Scenar with REM 7 1/2.
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Posted: 6/14/2021 4:16:25 AM EDT
[#1]
I have not had a problem, but was curious what you observed when you mentioned seeing signs of stress near the web?
Are you seeing loose primers or something worse? |
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Posted: 6/14/2021 7:26:45 AM EDT
[#2]
Any chance your bumping the shoulders back too far?
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Posted: 6/14/2021 9:31:28 AM EDT
[#3]
What “signs of stress”?
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Posted: 6/19/2021 9:18:32 PM EDT
[#4]
Quote HistoryOriginally Posted By forensicgun: Any chance your bumping the shoulders back too far? I measure the shoulder before sizing and after. I shoot for .002-3 of setback. Doubt I have any that would be beyond that. |
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Posted: 6/19/2021 9:23:00 PM EDT
[Last Edit: SpeyRod]
[#5]
Quote HistoryOriginally Posted By Rob01: What “signs of stress”? The ring is at the web and is enough to hook a finger nail on. These show that ring but were from my max load test. The load I have been using is much lower but now the brass is starting to show the same rings. I am traveling now but when I get home I’ll try to get some good photos. I’ll also add that the ejector swipe was very pronounced whereas it was previously mild. Loads were developed @ 40 degrees and these were shot at 80 degrees. I don’t expect H4350 to be an issue in those temp changes.  Attached File |
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Posted: 6/19/2021 10:37:03 PM EDT
[#6]
Have you looked in the chamber to see if there is a ring? A ridge big enough to catch a fingernail is a lot. Have you checked inside to see if it’s starting to get a head separation?
Also I usually bump .001” and max would be the .002”. |
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Posted: 6/20/2021 12:42:48 AM EDT
[#7]
OP,
Is this with your 18” gasser? |
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Posted: 6/20/2021 1:54:20 AM EDT
[#8]
Quote HistoryOriginally Posted By SpeyRod: The ring is at the web and is enough to hook a finger nail on. These show that ring but were from my max load test. The load I have been using is much lower but now the brass is starting to show the same rings. I am traveling now but when I get home I’ll try to get some good photos. I’ll also add that the ejector swipe was very pronounced whereas it was previously mild. Loads were developed @ 40 degrees and these were shot at 80 degrees. I don’t expect H4350 to be an issue in those temp changes. https://www.ar15.com/media/mediaFiles/152968/A810DC66-EC52-49F2-A368-150F1946715C_jpe-1984467.JPG Damn, looks like that brass has had a hard life... 
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Posted: 6/20/2021 11:52:56 AM EDT
[#9]
Quote HistoryOriginally Posted By SuperJlarge: OP, Is this with your 18” gasser? Yes. |
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Posted: 6/20/2021 11:56:31 AM EDT
[Last Edit: SpeyRod]
[#10]
Quote HistoryOriginally Posted By AKSnowRider: Damn, looks like that brass has had a hard life... Those cases were the top end of my load testing. The load I settled on was 40.7gr H4350 under a 139 Scenar. That’s the load I am concerned with now. |
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Posted: 6/20/2021 1:52:46 PM EDT
[#11]
Quote HistoryOriginally Posted By SpeyRod: Yes. That explains everything. Gas guns will beat up brass. I wouldn't use Lapua brass in a gas gun. |
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Posted: 6/20/2021 2:15:48 PM EDT
[#12]
Quote HistoryOriginally Posted By Rob01: That explains everything. Gas guns will beat up brass. I wouldn't use Lapua brass in a gas gun. Quote HistoryOriginally Posted By Rob01: Originally Posted By SpeyRod: Yes. That explains everything. Gas guns will beat up brass. I wouldn't use Lapua brass in a gas gun. Yep. This is “my guns timing is out of whack” not a brass issue. But it looks like a brass issue. I assume this gun also has a mid-length gas system? |
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Posted: 6/20/2021 3:10:44 PM EDT
[Last Edit: SpeyRod]
[#13]
Quote HistoryOriginally Posted By ziarifleman: Yep. This is “my guns timing is out of whack” not a brass issue. But it looks like a brass issue. I assume this gun also has a mid-length gas system? Pretty sure LT uses rifle+2 gas system. When I get home I am going to cut a case in half. I am curious what it looks like inside. I can’t detect a groove using a paper clip. But then my hands are kind of numb… |
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Posted: 6/20/2021 3:42:32 PM EDT
[#14]
Quote HistoryOriginally Posted By SpeyRod: Those cases were the top end of my load testing. The load I settled on was 40.7gr H4350 under a 139 Scenar. That’s the load I am concerned with now. Of course, being a gas gun explains a lot...hard to justify premium brass on a gas gun...
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Posted: 6/20/2021 6:41:47 PM EDT
[#15]
Quote HistoryOriginally Posted By AKSnowRider: Of course, being a gas gun explains a lot...hard to justify premium brass on a gas gun... The Lapua did well in my 556 Tobr. This is the first big block I have run it in. Sounds like I just need to buy some different brass for the gasser. |
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Posted: 6/20/2021 9:14:47 PM EDT
[#16]
Quote HistoryOriginally Posted By SpeyRod: The Lapua did well in my 556 Tobr. This is the first big block I have run it in. Sounds like I just need to buy some different brass for the gasser. Yup. I love Lapua, but I only use it in bolt guns. It’s probably good for 223/5.56 gas guns, but I’d stick to Hornady brass in a 6.5creed gas gun. There’s just too much going on with operation and pressures to risk trashing the expensive brass after 3-4 firings. |
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Posted: 6/20/2021 10:12:22 PM EDT
[#17]
Quote HistoryOriginally Posted By SuperJlarge: Yup. I love Lapua, but I only use it in bolt guns. It’s probably good for 223/5.56 gas guns, but I’d stick to Hornady brass in a 6.5creed gas gun. There’s just too much going on with operation and pressures to risk trashing the expensive brass after 3-4 firings. Learning as I go! Thanks! Bolt gun is on order so I’ll save the rest of the Lapua brass for it. |
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