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Posted: 3/17/2024 9:57:25 PM EDT
I’m a glutton for punishment from gun manufactures. This is the 3rd pistol in 3 years (twice from Colt, now this Glock) that will have to go back to the manufacture, bought new.
Groupings were 8” @ 12 yards using 135gr Nosler and 200gr Montana Bullet Works. Moved COL out, in, tried the full powder charge as recommended by Hodgdon. All were absolute crap groups. Also tried different charges using different COLs. SAAMI:  Attached FileGlock Perfection.   Attached File Attached File |
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Posted: 3/17/2024 10:01:28 PM EDT
[#1]
That's not to allow for expansion?
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KY, USA
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Posted: 3/17/2024 10:01:53 PM EDT
[#2]
The 0.00045 variance on either end from the theoretical cartridge is to account for different manufactuers? Chamber has to physically be bigger than the cartridge if only by a hair, as it is not a close slip-fit
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Posted: 3/17/2024 10:02:34 PM EDT
[#3]
I would try the gun with factory ammo before sending it back. A box of CCI or Blazer brass.
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Posted: 3/17/2024 10:03:14 PM EDT
[Last Edit: StevenH]
[#4]
How does factory ammo shoot?
Are you flinching or anticipating recoil? Have a good shooter try it with factory ammo |
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Posted: 3/17/2024 10:03:27 PM EDT
[#5]
It's a $30 caliper.
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Posted: 3/17/2024 10:04:47 PM EDT
[#6]
Calipers aren't really that precise, you need a mic for real accuracy.
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Posted: 3/17/2024 10:05:10 PM EDT
[#7]
I mean its a pocket 10mm glock. what did you expect? sub moa?
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Posted: 3/17/2024 10:05:14 PM EDT
[#8]
School of the American Rifle alt account ?
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Posted: 3/17/2024 10:05:34 PM EDT
[Last Edit: Badlatitude]
[#9]
Nvm
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SC, USA
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Posted: 3/17/2024 10:06:22 PM EDT
[#10]
Quote HistoryOriginally Posted By zephyr: It's a $30 caliper. Yeah, this |
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USA
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Posted: 3/17/2024 10:07:30 PM EDT
[#11]
It’s a Glock, who cares?
If it goes bang it’s good enough. |
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Posted: 3/17/2024 10:07:35 PM EDT
[#12]
I would put some factory ammo through it and have a friend try it too.
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Posted: 3/17/2024 10:07:45 PM EDT
[Last Edit: Coffin-Nail]
[#13]
Also, what you're posting are the cartridge specs not the chamber.
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AZ, USA
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Posted: 3/17/2024 10:07:46 PM EDT
[#14]
Originally Posted By rabidus: I’m a glutton for punishment from gun manufactures. This is the 3rd pistol in 3 years (twice from Colt, now this Glock) that will have to go back to the manufacture, bought new. Groupings were 8” @ 12 yards using 135gr Nosler and 200gr Montana Bullet Works. Moved COL out, in, tried the full powder charge as recommended by Hodgdon. All were absolute crap groups. Also tried different charges using different COLs. SAAMI: https://www.ar15.com/media/mediaFiles/170028/IMG_0042_jpeg-3162198.JPG Glock Perfection. https://www.ar15.com/media/mediaFiles/170028/IMG_0043_jpeg-3162199.JPG https://www.ar15.com/media/mediaFiles/170028/IMG_0039_jpeg-3162200.JPG You been watching SOTAR? |
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Posted: 3/17/2024 10:08:55 PM EDT
[#15]
Originally Posted By rabidus: I'm a glutton for punishment from gun manufactures. This is the 3rd pistol in 3 years (twice from Colt, now this Glock) that will have to go back to the manufacture, bought new. Groupings were 8" @ 12 yards using 135gr Nosler and 200gr Montana Bullet Works. Moved COL out, in, tried the full powder charge as recommended by Hodgdon. All were absolute crap groups. Also tried different charges using different COLs. SAAMI: https://www.ar15.com/media/mediaFiles/170028/IMG_0042_jpeg-3162198.JPG Glock Perfection. https://www.ar15.com/media/mediaFiles/170028/IMG_0043_jpeg-3162199.JPG https://www.ar15.com/media/mediaFiles/170028/IMG_0039_jpeg-3162200.JPG |
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Posted: 3/17/2024 10:09:44 PM EDT
[#16]
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USA
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Posted: 3/17/2024 10:09:53 PM EDT
[#17]
I do not see enough information here that would cause me to send that back.
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TX, USA
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Posted: 3/17/2024 10:11:05 PM EDT
[#18]
Lol reloaders.
Spend the money on factory ammo and get back to us. |
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CO, USA
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Posted: 3/17/2024 10:11:35 PM EDT
[#19]
I think the problem is probably the Indian and not the arrow dude. If you’re getting consistently crappy groups from a variety of pistols, you need to shoot more and measure less.
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Posted: 3/17/2024 10:12:09 PM EDT
[Last Edit: ManiacRat]
[#20]
Quote HistoryOriginally Posted By Skydivesnake: School of the American Rifle alt account ?  I learn from him. But he goes pretty far on some stuff. |
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Posted: 3/17/2024 10:12:17 PM EDT
[#21]
Maybe see if Bartlein will build you a barrel.
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Posted: 3/17/2024 10:13:08 PM EDT
[#22]
If you’re not happy with it, send it back.
Or get an aftermarket barrel. |
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Posted: 3/17/2024 10:13:14 PM EDT
[#23]
From what the drawings say your calipers say the chamber is .003 over but that's not a trustworthy number with how you're measuring that. If anything it's showing it to be very close.
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Posted: 3/17/2024 10:13:37 PM EDT
[#24]
Quote HistoryOriginally Posted By Coffin-Nail: Also, what you're posting are the cartridge specs not the chamber. This. |
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Posted: 3/17/2024 10:14:15 PM EDT
[#25]
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Posted: 3/17/2024 10:15:43 PM EDT
[#26]
Send it back so they can laugh at you
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Posted: 3/17/2024 10:15:50 PM EDT
[#27]
How’s the headspace?
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PA, USA
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Posted: 3/17/2024 10:16:12 PM EDT
[Last Edit: jalcon9]
[#28]
My G20 Gen4…the chambered round def moves in the barrel. I can hear it. I’ve confirmed this in a few ways and it bothered the shit out of me for months. Luckily I have two friends with Glock 20s and I literally tried every combination of my extractor, springs, my barrel, their slide…you name it. I even tried a KKM barrel. Still did it. I eventually narrowed it down to my slide . Literally if I tap the right side of the side it’ll be quiet. Tap the left side and shake it, bullet rattles. I can even do this with a chambered slide while the slide is not even on the frame, but everything else in place…barrel, recoil spring etc. stick a pencil eraser side in the barrel, and it’ll stay quiet. I duplicated this in their slides too but not as much as mine does.
It is definitely something to do with the way the extractor is grabbing the rim of the cartridge. I’ve tried 4 extractors, they all do it…different extractor plungers…you name it, I’ve tried it. Something to do with my particular slide, maybe the cutout slot for the extractor idk. I ended up sending it to Glock, they didn’t say much really. Shoots fine. Seems accurate enough although I’m not a great shooter. I stopped caring about it. 
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Posted: 3/17/2024 10:17:04 PM EDT
[#29]
Quote HistoryOriginally Posted By StevenH: How does factory ammo shoot? Are you flinching or anticipating recoil? Have a good shooter try it with factory ammo Not flinching. Shoot 12ga slugs, 338LM, 45-70, full power 45 ACP+p no problemo. |
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CA, USA
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Posted: 3/17/2024 10:17:45 PM EDT
[#30]
Whatever you do, please, for the love of god, don't go bug the retailer about it.
Let Glock deal with this bullshit directly. |
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Posted: 3/17/2024 10:18:19 PM EDT
[#31]
Just shoot it
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WY, USA
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Posted: 3/17/2024 10:18:33 PM EDT
[#32]
reloads on a pocket pistol and you're wondering why it's grouping bad?
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Posted: 3/17/2024 10:19:59 PM EDT
[#33]
Well, I'd try some factory ammo and a rest.
8" at 12 yards does not sound correct. If that doesn't help, try decaf or maybe some more vodka for the shakes |
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Posted: 3/17/2024 10:20:55 PM EDT
[#34]
Quote HistoryOriginally Posted By rabidus: Not flinching. Shoot 12ga slugs, 338LM, 45-70, full power 45 ACP+p no problemo. It's you, not the gun. |
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Posted: 3/17/2024 10:21:48 PM EDT
[#35]
Quote HistoryOriginally Posted By slappomatt: I mean its a pocket 10mm glock. what did you expect? sub moa? My two 19s get this:  Attached File(1 flyer as I got excited on the 5th shot) Recent 1911 load development  Attached FileI’m not flinching, it does not recoil that much. |
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Posted: 3/17/2024 10:21:55 PM EDT
[#36]
There is a common denominator here that OP is missing.
I would ask if you want me to have gaston call you, but……. |
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Posted: 3/17/2024 10:22:54 PM EDT
[#37]
It’s a Glock, it goes bang. That’s what it does. That’s all it’s ever going to do.
If you want a target pistol find an old sig 210. Jmo |
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Posted: 3/17/2024 10:24:29 PM EDT
[#38]
Quote HistoryOriginally Posted By rabidus: My two 19s get this: https://www.ar15.com/media/mediaFiles/170028/IMG_8072_jpeg-3162228.JPG (1 flyer as I got excited on the 5th shot) Recent 1911 load development https://www.ar15.com/media/mediaFiles/170028/IMG_9628_jpeg-3162229.JPG I’m not flinching, it does not recoil that much. You're posting the dimensions of the cartridge not the chamber which is right there on the same SAAMI page. If you're reloading and don't understand that there's a difference I can't say I'd have much faith in your reloading or judgement. You came into this thread declaring you already know you need to send it back acting like you have evidence, but you really don't. If it'll make you feel better send it back, but you've shown us no real proof. |
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TN, USA
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Posted: 3/17/2024 10:25:33 PM EDT
[#39]
Quote HistoryOriginally Posted By Skydivesnake: School of the American Rifle alt account ?  Attached File |
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USA
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Posted: 3/17/2024 10:26:11 PM EDT
[#40]
Would you like Gaston to call you?
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Posted: 3/17/2024 10:26:17 PM EDT
[#41]
Furthermore that is not an accurate way to measure chamber dimension with that tool(which I might add is not exactly a precision one).
I'll have Kathryn call you. |
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Posted: 3/17/2024 10:27:38 PM EDT
[#42]
Glocks are known for increased reliability. Part of that is having a slightly oversized chamber and some loose tolerances. If you want a match fit. Get a match barrel. Your gun is fine. You’re wasting everyone’s time and should feel bad. If you want a match we can laugh at you because of feeding and reliability issues after we go down that route.
You’re also not being consistent with your calipers in how you’re measuring the chamber. I know you’re thinking you’re the genius behind all of the reasons and excuses you have. Reality is you can’t hit shit with it and you’re blaming the tool not the man holding it. |
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AZ, USA
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Posted: 3/17/2024 10:28:57 PM EDT
[#43]
Have Gaston call you...
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GA, USA
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Posted: 3/17/2024 10:28:57 PM EDT
[Last Edit: KoolOperator]
[#44]
I thought you knew what you were doing, until I saw your caliper in action. That's a crap tool and incorrect way to measure that space against the wrong data points.
Stick to factory ammo. |
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TX, USA
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Posted: 3/17/2024 10:35:17 PM EDT
[#45]
Quote HistoryOriginally Posted By rabidus: My two 19s get this: https://www.ar15.com/media/mediaFiles/170028/IMG_8072_jpeg-3162228.JPG (1 flyer as I got excited on the 5th shot) Recent 1911 load development https://www.ar15.com/media/mediaFiles/170028/IMG_9628_jpeg-3162229.JPG I’m not flinching, it does not recoil that much. Quote HistoryOriginally Posted By rabidus: Originally Posted By slappomatt: I mean its a pocket 10mm glock. what did you expect? sub moa? My two 19s get this: https://www.ar15.com/media/mediaFiles/170028/IMG_8072_jpeg-3162228.JPG (1 flyer as I got excited on the 5th shot) Recent 1911 load development https://www.ar15.com/media/mediaFiles/170028/IMG_9628_jpeg-3162229.JPG I’m not flinching, it does not recoil that much. You may be a very skilled shooter. You may know what you are doing behind the loading bench. But you don’t have a clue about QC or what is critical for accuracy. You are measuring the ID of a chamber with a cheap POS digital caliper. Never mind that a caliper is not the best way to do that. You are using junk equipment. And that dimension is pretty meaningless to group sizes. It is just too close to be causing your groups. |
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Posted: 3/17/2024 10:41:00 PM EDT
[#46]
You need to get a proper inside mic if you want a true picture of that chamber.
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Posted: 3/17/2024 10:44:38 PM EDT
[#47]
Quote HistoryOriginally Posted By Kiltakaze: I think the problem is probably the Indian and not the arrow dude. If you’re getting consistently crappy groups from a variety of pistols, you need to shoot more and measure less. lol The Colts had chattered bores. |
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Posted: 3/17/2024 10:45:05 PM EDT
[#48]
You can shoot one gun fine and be terrible with another, especially if it’s more powerful with less grip. You can also just have a bad day. A little dehydrated, nerves, who knows.
I would shoot from a rest and then have a known competent shooter try to eliminate you as the issue. I would also stop with the reloads. That’s another way of eliminating you as the source of the issue. If it’s still bad after that, go ahead and send it back. But what I’m reading is the reason why manufacturers have you ship back on your dime until they determine if there is an issue. 8” at 12yds really requires something to be seriously wrong, and is much more likely to be end user error. |
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Posted: 3/17/2024 10:48:01 PM EDT
[Last Edit: HBruns]
[#49]
Is the 0.425" dimension the SAMMI max for a loaded round of ammo, or the chamber dimension?
A ~0.007" difference is about right for a factory gun. If the ammo and the chamber are the same dimension, you'll never be able to chamber a round. There MUST be clearance or it binds. ETA - Upon a quick internet search, the .425" dimension is for a loaded round of 10mm ammunition. 10.81mm = ~0.42556"  https://en.wikipedia.org/wiki/10mm_Auto#/media/File:10_mm_Auto.jpg |
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Posted: 3/17/2024 10:50:35 PM EDT
[#50]
Quote HistoryOriginally Posted By Tangotag: How’s the headspace? Generally good I think but he does seem a bit over analytical. |
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