Glock 20 accuracy issues

[Arrow]

I have had my glock 20 for a few months now. It's is a gen 3. When I first got it it was shooting about a foot high at 20 yards. No big deal because every new glock I have ever had shot high for me. I'm about 400!rounds through it now and it elevation had settled down but there is something not right with accuracy. I have shot extreme copper plated bullets 180 run over 6 grains tightgroup. I have also shot nosler 135 jhp over 12.5 bluedot. These are just random powder charges out of a book, no accuracy load worked up. I for the life of me can't get this gun to shoot. I used to have a glock 30 standard frame and I shot tha scary accurate so I know it's not the fatter grip of th 10mm tha is throwing me off especially because this is a short frame. I have always just thrown together target loads for handguns using a couple grains under max and never had any accuracy issues from glocks, 1911, or revolvers. Today just to compare I shot 5 shots through my 23 at 10 yards and they were in 1.5-2" group dead center. Then took the 20sf with the nosler loads and shot 5 shots after dry firing to get used to the 20sf trigger again. Those 5 shots went into about a 5-6" group at 10 yards. I could shoot a tighter more consistent group with a snub nose. The 20 has quite a bit longer sight radius than the 23 also which should help with accuracy. It's not recoil that's causing me to shoot like this because I can stack bullets on top I each other with my 3" .44 mag. I hope that covers everything. Please help if you have any advice. Thanks.

[The_Shadow]

In the pull-downs of the cartridges with the Nosler bullets that I measured I have found many to be 0.3990" in stead of 0.4000", this may be something to look at.

Also you may want to consider a new a new Slide lock setup http://glocktalk.com/forums/showthread.php?t=851754
TR Graham's MGSL  "Match Grade Slide Lock"  it is said to improve groups and more reliable lock ups.

[Arrow]

I checked the slide stop on my 20sf and the wear seams to be very consistent in a line straight across the back. I still might try a mgsl. I was shooting extreme 180 grain round nose bullets also so I don't think under size bullets is my problem. I'm pretty confident in my shooting abilities to the point where a 6" group at only 10 yards is a problem with the gun. What else could be wrong with it? Is there a such thing as a bad barrel? I did put a 22 lb recoil spring in it with a lonewolf ss guildrod. Could this do anything to the accuracy?

[pacapcop]

I have the same set up as you do Arrow. Yes, my first few months shots were high till I got use to the Glock in general. Shooting 135's from Underwood. After few months the groups were where tighter. It's no where along the lines of my Witness but much improved.

[Arrow]

I have been shooting glocks for about 8 years. They have always started off high for me but even when high the groups were still pretty tight. Any ideas what could be going on with this specific gun? Has anyone noticed any quality control issues with newer glocks like you see on a lot of different firearms now adays? I think I'm going to try the mgsl and a lonewolf barrel. That should fix some issues but I just don't understand why there are accuracy issues in the first place. Thanks for the help guys.

[pacapcop]

For me it was getting use to the Glock, my first and only. No rhyme or reason with pistol itself, just plain ole shooting till I got the platform down. Wish I could assist more. I just placed front sight down further.

[tommac919]

snip...Has anyone noticed any quality control issues with newer glocks like you see on a lot of different firearms now adays? ..snip..

Just got a new G20 gen 3 this month, manf date in Aug... no problems, all seems fine after 400 rounds... it's as accurate as my Sig for me.

maybe try a new barrel?

[4949shooter]

The model 20, even in the SF form, has a larger grip than the rest of the Glock pistols. It can take some getting used to. I know that I have to get the proper grip on mine in order to shoot well.

When I switch the 20 back and forth with my 22 I notice a big difference.

Perhaps having some other shooters try your pistol might be of help. If the problem still exists then you have narrowed it down to your specific gun.

[Yondering]

I have shot extreme copper plated bullets 180 run over 6 grains tightgroup. I have also shot nosler 135 jhp over 12.5 bluedot. These are just random powder charges out of a book, no accuracy load worked up. I for the life of me can't get this gun to shoot.

I'd guess it's partly your ammo. Those copper plated bullets are not known for great accuracy in a Glock barrel, and the 135gr bullets have never been real accurate in any of my 10mm's either.

Try some different ammo with a regular jacketed bullet in one of the more common weights and report back.

[snuffy]

How does it shoot off a bench rest or with some good factory ammo? I've heard from some of my friends who load that the crimp can cause some problems too. I'm really not experienced enough to give advice
I let my wife shoot my 20SF with LW threaded barrel with comp and she put 4 out of 5 180gr PPU HPs in an 8" circle at 12 yards. Impressed me since she's only been shooting since the first of July, and 9mm at that. This was her first 10mm shots.