Glock 20 Split Brass

[80Goat]

I just bought a Glock 20. I have run about 300 rounds through the gun without any problems. I bought some Cor Bon 155 grain DPX loads. I shot 10 rounds to see how the gun would function with the loads. When I picked up the brass, I found 7 of the 10 were split. The previous 300 rounds of American Eagle did not have a single split.

I disassembled the Glock and cleaned the gun. I held just the barrel and dropped a Cor Bon round into the chamber. I could shake the barrel side-to-side and hear it rattle around in the chamber. I put an American Eagle round in the chamber and it rattled, just not as much as the Cor Bon.

Anyone else have this problem?

 

[rcmodel]

Perhaps just a batch of bad brass.

I have had the same thing happen with some Federal 9mm the first time it was reloaded.

rc

 

[jeepnik]

First I'd suggest not firing any more of that in your Glock.

Second, I'd contact Cor Bon. Offer to send both brass and unfired rounds back to them for analysis. If they have a problem they WANT to know about it.

You might also contact Glock. It could be the ammo, but it could also be the chamber. You could be doing either or both manufacturers a favor, and they are usually grateful.

 

[dakota1911]

Yup as above you may have hit two out of speck things in different directions. I had a Glock 20 years ago and it was O.K. May have still owned it but a shooty buddy reeeely wanted it and gave me more than I thought it was worth.

 

[Dan-O]

Corbon is hot. American Eagle is watered down to .40 s&w levels. An aftermarket barrel is the only way to safely shoot full tilt 10mm loads and expect to reload the cases. If you don't roll your own then you're wasting your time and money.

 

[rcmodel]

Hot or not, loose or not, good brass shouldn't split the first firing.

rc

 

[agtman]

Seems you've got an ammo issue, not a gun issue.

 

[readyeddy]

When I started shooting my Glock 20 over 20 years ago, we were hand loading it pretty hot. Cases would start splitting around the third or forth loading.

Back then the only factory loads I shot were Winchester Silvertips and a little bit of Norma. Both were on the hotter side and none of them split on the first cycle.

I would take the Corbon's back and tell them about the problem.

 

[80Goat]

Thanks for the replies.

I tossed the brass at the range, so I do not have any to send to the Cor Bon. I am not going to fire any that is left in the Glock just to produce empty brass. I will send the rest back to Cor Bon.

I am not going to buy another barrel just to shoot factory ammo that is loaded to specifications. This is my first and probably my last Glock. I bought it because I could not find a Sig P220 in 10mm. I really wanted to get a 10mm. Two weeks after buying the Glock my LGS gets the Sig 10mm AND has a $50 sale on new Sigs.

Going to pick up the Sig tomorrow. Looks like the Glock is going to the bottom shelf of the gun safe.

 

[Ohen Cepel]

I'm not a Glock fan-boy. However, the 20 is a great pistol so I wouldn't give up on it yet. Since the other ammo didn't have an issue it could be that the Cor Bon was out of spec, it happens to the best of them at times.

May be worth it to send the Glock back if you think that is the issue. If it is out of spec they will make it right, and will usually update it while it's there. Piece of mind if you keep it or want to sell it down the road, you can tell the next guy it's be factory inspected and is good to go.

Let us know what you think of the SIG. I'm tempted there myself!

 

[Dan-O]

True. But he shouldn't waste his time and money getting a new gluck barrel. Just spend the $ and get a fully suppoted barrel cause that's what you should be using anyways.

 

[80Goat]

I have been a Sig fan since the 1980s so I am looking forward to the P220.

Not going to get rid of the Glock - I will eventually work through the problem.

 

[HammsBeer]

I've shot a P220 in 10mm, nice shooting gun. You can tell there's some power behind it, but it's not punishing to shoot. If I were to get a 10mm it'd be a P220.

 

[80Goat]

Solved the problem with the split Cor Bon brass in the G20. The Underwood 180 grain JHP is listed at 1350 fps, 688 ft lbs. No problems with the brass. Trigger is crisp right out of the box. Adjustable sights are great. Recoil was stiff, but manageable.

Still have the G20, though it may not see much range time.

 

[rcmodel]

Problem isn't solved.

Shoot some of the Cor-Bon in the SIG and see if the cases split.

If they do, it was in fact bad brass, not the Glock causing it.

Only Then, the problem would be solved.

rc

 

[ku4hx]

In the early '90s, I had the same problem with a S&W 1006 and Winchester brass. This was new ,unfired, brass and in their very first loading (mid-power) every case split. Didn't happen with Remington brass and I never suspected the gun. I dumped all 100 cases about 80 of which had never been loaded and never had the problem again. To this day I haven't used Winchester 10mm brass. Winchester has probably fixed the problem long ago, but Starline is too good not to use exclusively.

 

[80Goat]

Measured fired brass diameter with dial caliper.

Glock 20: the Cor Bon and Federal American Eagle both averaged .434 inches
Sig P220: the Underwood and Federal American Eagle both averaged .427 inches

The Glock chamber appears to be 7 thousands larger.

 

[SDGlock23]

It's a brass issue, I've seen split cases from nearly every gun I've owned at one point in time or another, even 10mm's I've owned. It's brittle brass, basically.

 

[ku4hx]

The Glock chamber appears to be 7 thousands larger.

Call Glock; good people all.

 

[Vernon1]

Glock Fan Boy Speaks

The person who advocated sending it back to the factory gets a gold star.

I have been to the Glock factory several times.

IMHO these folks have forgotten more about their products than most people know.

The Glock products all are their passion. I assure you they would like very much to examine your pistol-for free.

While they have the gun they will update it,clean it, replace anything that needs to be replaced for free.

They are great people. However, they are straight to the point.

Send the gun back to the men who made it. You will sleep better for having done so.

Tell them what the gun did. I promise you they really want to know.