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Posted: 3/15/2015 8:25:35 PM EDT
[#1]
Quote HistoryQuoted:
omd-what barrel length and model? tOBR 18" - Unsupppressed, Factory A2 flashhider shooting FGMM 168gr. Only thing not factory is a hydraulic buffer I put in from Brownell's. |
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Posted: 3/17/2015 10:51:54 AM EDT
[#2]
I'd like to point out that sticky chambers can also cause swipes. Make sure you guys are using chamber brushes and cleaning AND DRYING those chambers. If you guys are putting oiled patches down your barrels, make sure the LAST THING YOU DO is swab out the chamber and make sure it's dry as a bone.
-ZA |
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Posted: 3/17/2015 11:51:14 AM EDT
[#3]
Looking at the brass that exhibit the case head swipes also show various sign of primer cratering. I did not think to mention it earlier,
Kinda thought someone else would point it out. Short of separated case heads or blown primers, these pressure signs are what we look out for during load development. Disclaimer: My experience with loading for a 7.62 gas gun has been restricted to my SR-25. I realize that there are many more dynamics at work in this platform than a bolt gun. I am interested in where this leads. |
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Posted: 3/17/2015 1:11:48 PM EDT
[#4]
Quote HistoryQuoted: Looking at the brass that exhibit the case head swipes also show various sign of primer cratering. I did not think to mention it earlier, Kinda thought someone else would point it out. Short of separated case heads or blown primers, these pressure signs are what we look out for during load development. Disclaimer: My experience with loading for a 7.62 gas gun has been restricted to my SR-25. I realize that there are many more dynamics at work in this platform than a bolt gun. I am interested in where this leads.  |
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Posted: 3/17/2015 1:25:31 PM EDT
[#5]
Primers display a reverse image of the bolt's firing pin hole ...
ETA - Mixed bag, we've had temps in the teens here of late going into the 70s some days ... mix that with different lots/brands of ammo and a random fistful looks like the pic above. |
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Posted: 3/19/2015 8:42:07 PM EDT
[#6]
I did shoot some more. Found out that it is getting the burrs even on the 150grain and the 168gr. When using the suppressed mode and only loading 1 bullet per time, it only got the most faint of swipes, but the bolt would not lock back as suggested. When I switched the gun back to unsupressed, the first shot came out with no swipe at all, and the bolt locked back. So I was thinking it had something to do with the suppression switch(maybe not fully switched), but after firing 5 more rounds they all come out with burrs on them. It's funny that that is one of about 2 rounds that have come out with no swipes.
The ones in supressed mode looked more like the pictures mark posted. |
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Posted: 3/20/2015 5:34:29 PM EDT
[#7]
Quote HistoryQuoted:
I did shoot some more. Found out that it is getting the burrs even on the 150grain and the 168gr. When using the suppressed mode and only loading 1 bullet per time, it only got the most faint of swipes, but the bolt would not lock back as suggested. When I switched the gun back to unsupressed, the first shot came out with no swipe at all, and the bolt locked back. So I was thinking it had something to do with the suppression switch(maybe not fully switched), but after firing 5 more rounds they all come out with burrs on them. It's funny that that is one of about 2 rounds that have come out with no swipes. The ones in supressed mode looked more like the pictures mark posted. ouborat7, Watch for a box tomorrow ... ML |
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Posted: 3/21/2015 12:21:07 PM EDT
[#8]
Awesome...got it...will test it as soon as I can
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Posted: 3/21/2015 3:08:04 PM EDT
[#9]
Im dealing with the same issue. Just got my MG back and made it out to the range last night and i have burrs on my case heads.
18" tOBR using FGMM 175 SMK's. |
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Posted: 3/29/2015 1:04:39 AM EDT
[#10]
For anyone who is interested, I received a new bolt from Larue. I have been sick so just got to test it out today.
I went back out and shot off about 15 more rounds. I think I shot 5 of the 150gr Fusion MSR and 10 of the 168gr FGMM. Most of this ammo was from the exact same boxes that I had used the last time I went out when I was getting burrs. Anyways, now the cases are coming out clean. Most of the cases either show no swipes or very light swipes. They look very similar to the pictures that Mark posted holding brass. It's hard to tell from pictures, but this is significantly better than what it was before. I'm not sure if this was technically a problem as it appears most people who use their guns like this are having no problems with them, but it was concerning to me. Thanks to Mark for taking care of this for me! I am very excited about this! |
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Posted: 3/29/2015 10:37:25 AM EDT
[#11]
And Larue proves once again why they are the best in the industry!
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Posted: 3/29/2015 11:36:49 AM EDT
[#12]
Quote HistoryQuoted:
And Larue proves once again why they are the best in the industry! Yeah, well, looks like we missed a small Six-Sigma step. 
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Posted: 3/30/2015 4:25:43 PM EDT
[#13]
Quote HistoryQuoted:
Yeah, well, looks like we missed a small Six-Sigma step. Quote HistoryQuoted:
Quoted:
And Larue proves once again why they are the best in the industry! Yeah, well, looks like we missed a small Six-Sigma step. Six Sigma...... That class is coming up pretty quickly at work..... Uh! |
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Posted: 4/1/2015 8:46:00 PM EDT
[#14]
Quote HistoryQuoted:
Yeah, well, looks like we missed a small Six-Sigma step. Quote HistoryQuoted:
Quoted:
And Larue proves once again why they are the best in the industry! Yeah, well, looks like we missed a small Six-Sigma step. Gauging ejector protrusion? |
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Posted: 4/2/2015 6:07:06 PM EDT
[#15]
Sadly this is happening with my 14.5in 7.62 TOBR as well. This is all the brass I picked up from a range trip today. I hadn't bothered to look until I had seen this thread. Most of the brass pictures shows similar swipes.
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Posted: 4/2/2015 7:12:21 PM EDT
[#16]
Quote HistoryQuoted:
Yeah, well, looks like we missed a small Six-Sigma step. Quote HistoryQuoted:
Quoted:
And Larue proves once again why they are the best in the industry! Yeah, well, looks like we missed a small Six-Sigma step. Are you saying it's an issue that should be resolved? I've got one that does it and I reload but I haven't really cared to this point. My M1A used to chew them up worse. |
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Posted: 4/9/2015 2:44:24 AM EDT
[#17]
Quote HistoryQuoted:
Are you saying it's an issue that should be resolved? I've got one that does it and I reload but I haven't really cared to this point. My M1A used to chew them up worse. Quote HistoryQuoted:
Quoted:
Quoted:
And Larue proves once again why they are the best in the industry! Yeah, well, looks like we missed a small Six-Sigma step. Are you saying it's an issue that should be resolved? I've got one that does it and I reload but I haven't really cared to this point. My M1A used to chew them up worse. I agree, clarification would be appreciated. ETA: I love the accuracy my 18" pOBR consistently delivers but if the case head swipes and burrs could be eliminated; I'd be an even happier customer. |
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Posted: 4/9/2015 8:24:32 AM EDT
[#18]
Quote HistoryQuoted: Are you saying it's an issue that should be resolved? I've got one that does it and I reload but I haven't really cared to this point. My M1A used to chew them up worse. Quote HistoryQuoted: Quoted: Quoted: And Larue proves once again why they are the best in the industry! Yeah, well, looks like we missed a small Six-Sigma step. Are you saying it's an issue that should be resolved? I've got one that does it and I reload but I haven't really cared to this point. My M1A used to chew them up worse. Same. My 20" has always swiped brass. It's not too bad but I've had it for over 4 years. |
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