9MM Pressure Check [Archive] - Glock Talk

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shooter1911
04-27-2014, 13:46
I have been loading many years, and am fully aware of pressure issues, but I recently started loading some 9MM for my son"s G19. For those who load 9mm please take a look at these fired shells and let me know what you think is going on with this primer strike. The load I am using is well under max.

Glock 19
147gr Zero FMJ
3.4gr Titegroup
WSP Primers
1.130 OAL

Thanks

http://i839.photobucket.com/albums/zz316/myanof/DSCN1127_zps8a1b4ea3.jpg

Steel Head
04-27-2014, 13:52
Normal Glock primer strike.
They all look like that.

Dave.1
04-27-2014, 15:33
Look normal, here's one of mine on the left.
http://i1103.photobucket.com/albums/g466/darock2/Gltech/GlockStriker_zpsbe6cc270.jpg (http://s1103.photobucket.com/user/darock2/media/Gltech/GlockStriker_zpsbe6cc270.jpg.html)

Either that or we both have a problem.

Dave

Colorado4Wheel
04-27-2014, 15:37
Totally normal. But I bet it's burnt, bulged and dented and totally un-usable. Send me all your brass, on your own dime, for you own safety.

SJ 40
04-27-2014, 15:51
Nothing to worry about out of a Glock. If you are interested in pressure of your loads from semi auto pistol cases,measure directly above the groove of the rim on the case body. Compare that measurement to a factory fired case from the same chamber,that will provide you with a expansion measurement to compare your loads with. SJ 40

WiskyT
04-27-2014, 16:36
Normal as is the Beretta case shown in Dave's pic. We had 120 M96 Berettas and every one of them left primer marks like that as have every piece of brass I have ever picked up from a Beretta 92/96.

Steel Head
04-27-2014, 16:49
Totally normal. But I bet it's burnt, bulged and dented and totally un-usable. Send me all your brass, on your own dime, for you own safety.

Nice of you to take one for the team:whistling:

"On your own dime, for your own safety":rofl:

shooter1911
04-27-2014, 19:33
Thanks for easing my mind. As long as I've been loading I've never seen this. Is there any explanation why Glocks have this anomaly?

fredj338
04-27-2014, 19:55
Thanks for easing my mind. As long as I've been loading I've never seen this. Is there any explanation why Glocks have this anomaly?

The slight oversize, rectangular firing pin slot/hole. As noted, they look fine.

shooter1911
04-27-2014, 20:38
Thanks again folks, mystery solved.

WiskyT
04-27-2014, 20:48
Thanks again folks, mystery solved.

It's a good question you raised. It shows that you were paying attention to the information about pressure signs in the manual(s) you have read. Your concern was valid as in most circumstances, the primer flow you saw would be a big STOP sign.

With Glocks, you'll see the high points of the flow wiped off by the firing pin hole when pressures get in the high range. The rectangle will have polished spots where metal was wiped off of it.

Dave.1
04-28-2014, 06:45
Another bit it trivia to file away, if you find any brass with the teardrop impression on the spent primer it's from an M&P. Also caused by the configuration of the striker hole in the breech face.

Dave

Colorado4Wheel
04-28-2014, 09:21
With Glocks, you'll see the high points of the flow wiped off by the firing pin hole when pressures get in the high range. The rectangle will have polished spots where metal was wiped off of it.

Interesting. Gonna have to keep an eye out for that.

Uncle Don
04-28-2014, 09:35
While I agree that they appear to be fine, the one on the left wouldn't have a tremendous amount to go before I would consider it on the high side. Anytime I see a very flat primer and the pin strike appears to be 3D in that material comes out from the sides, it's working on getting high.

Granted, it's got a some to go, but it's working on it, IMO.

Colorado4Wheel
04-28-2014, 11:08
With Glocks, you'll see the high points of the flow wiped off by the firing pin hole when pressures get in the high range. The rectangle will have polished spots where metal was wiped off of it.

Actually if you look close you can see a swipe of the primer on the first pic he posted.

WiskyT
04-28-2014, 16:00
Actually if you look close you can see a swipe of the primer on the first pic he posted.

MAybe, it looks like a reflection to me. The kind I'm talking about are obvious. It looks like someone took a file and made a pass over the proud part of the FP mark. Shoot a bunch like that and you'll have brass whiskers in your FP channel.