What loads are you using? 200 @1150 fps is about the limit for reliable operation. Have had thousands of trouble free rounds out of stock Gen 3 and Gen 5 G20’s with factory full power loads. No troubles out of a Gen 3 with hot underwood ammo, but I haven’t run any through a Gen 5. A 200 gr. @1200+ can’t do that the same bullet at 1150 (with 100% reliability) can also do. The extra 50-100 fps just isn’t needed, especially if it comes at the expense of reliability.

 

If that's true, it's lame and dumb: The most commercially popular (by far) 200gr hard cast loads (Underwood and Buffalo Bore) exceed 1150 fps. If I wanted to go 1150 or slower, heck, 200gr 40 S&W hard cast @ 1000 fps is readily available, I'd just use that. Making 10mm pistols that can't handle legit 10mm loads is dumb 🤷‍♂️

 

Have you inspected the feed ramp on the barrel?

I had a few fail to feeds in the G20's brother, the G21, when it was new and I used hollow points. I took a very close inspection of the feed ramp and noticed a small blemish in the middle of it. I used 1000 grit sand paper WET and a wooden dowel roughly the same width as the ramp, lightly sanded it, then polished with a dremel buffing wheel and some flintz, never had another jam in about 500 rounds now

Same mags, same hollow points, same OEM recoil spring that came with the gun.

DPM seem like good people, have you emailed them and explained what rounds you are using and asked for help? They will send you a custom spring for your load if they can.

 

Thanks for the idea. I haven't done anything like that -- based on my experiences working with gun companies' customer service departments, I'd consider any irreversible modification (even a minor one) of a stock part a last resort.

In any case, since it doesn't have problems with lighter loads of various bullet shapes, I'm inclined to think the problem ("problem") is simply the energy of full-power ammo, not the interaction between the bullet geometry and the smoothness (or lack thereof) of the feed ramp.

 

Federal solid core is a 200gr cast rated at 1200. It probably runs a bit less than 1200 out of a G20 and it runs fine in a G20.

Hornady just announced a ‘dangerous game’ load that is about the same, but a jacked non-expanding load.

Lost River offers a similar cast load. Trying to eke out an extra 100-150 fps doesn’t seem to be worth the effort to me.

 

200gr @ 1200 fps (specified) is exactly what my Glock 20 is choking on. (Well, technically 1250 fps, but that's starting to split hairs.) So I'm not too optimistic that it would handle that Federal load.

 

The 10mm load mentioned by the previous poster ...

10mm Auto 200 gr DGH™ Backcountry Defense™ - Hornady Manufacturing, Inc

...

www.hornady.com

It may not be sexy enough for the folks wishing a really hot-rodded 200gr load (1160fps from 4" test barrel), but if it does what it's advertised to do, and offers consistent reliability in a stock G20, might that not be good enough?

 

If it was reliable, absolutely, but if it's 1160 out of a 4" barrel, it's probably around 1200 out of a Glock 20, and that's about the same weight/velocity as the rounds it's currently choking on.

It might be worth a try, but if the problem is that Underwood is "too hot," well, that load is basically just as hot 🤷‍♂️

 

My chrono results won't help with why your having issues, but could help you compare different loads.

My XDME 4.5 has had no failures, from 450 ftlbs to 675 ftlbs.

I was disappointed with the Underwood 200gr HCFN, which averaged 1146 for me. I tested 3 different boxes on 2 different days. The 220gr was significantly stronger.

 

You know, back in the days when I was carrying a .44MAG or .45Colt for backwoods protection (our only dangerous wild animals of note being small CA black/brown bears, mountain lions and wild boar), and was an avid handloader, I looked for a combination of bullet weight, penetration and acurracy.

While sheer rompin', stompin' muzzle blast and ME 'power' was fun and entertaining, when it came time to consider that the rubber might have to meet the road, I found the best combination of the critical attributes were obtainable with some slightly lower velocity loads using medium to heavy bullet weights.

Granted, I based my hopes on the discussed experiences of hunters (since I'm not a hunter) who used those calibers for actual game taking and protection. However, the loads we developed (dad and I) were basically those rediscovered as having been proven successful in previous decades by a number of noted hunters/shooters. The wheel apparently still worked well in its round design.

 

Great thread guys. I recently bought some Buffalo Bore for my G20 and G40. I’ll try them soon with great caution.

 

MH, first of all do the 200gr hard cast rounds plunk test ok? 2nd, what is the exact failure mode? Do you have pics of the failure? I ran hundreds of full power 200gr hard cast thru my Gen 3 G20 with the only change being a 24lb ISMI recoil spring and captured stainless guide rod.

 

By "plunk test," do you mean, "can they chamber?" If so, yes. Failure to feed. No photos.

 

It’s funny. I waited forever for the Glock 20 Gen 5. Frustrated, I bought the M&P 2.0. I’ve been completely satisfied with it. No issues for me with the magazine drops but, as odd as it sounds, I haven’t talked to a lefty yet that has experienced that. It handles even the manliest 10mm with aplomb. I’m not the biggest fan of the trigger but very satisfied with the gun overall and glad Glock was late to the game.

 

I've shared video in which it's abundantly clear that I'm not hitting the mag release, if that's what you're implying. It's an actual mechanical defect that was present in many of the early M&P 10mms.

 

I hope that the G40 doesn't have the same problem as I just ordered one. I am thinking about getting a 20 or 29 with a certificate that I won at a match last month.

 

My 20-5 is very accurate but has had trigger reset issues. My XDME 4.5 has been 100 pct reliable.

 

I must be lucky. I have a G20.5 and it eats my handloaded 200 WFNGC Montana Bullet Company at a chronographed 1200 fps without issue. I do check every loaded rounded in a Wilson case gauge. Maybe my quality control is better😂😂. My G40 eats them up also🤔. Both of them are stock other than sights and optics.

 

OP has an ammo problem not a pistol problem.

 

Lol, no. Don't make excuses for Glock. It's a 10mm pistol, and it won't run the most popular factory ammo for predator defense, i.e., the number one reason why people buy 10mm pistols in 2024.

That's inexcusable 🤷‍♂️

 

Have you called Glock? I did not see that mentioned in the thread. I bet they know the secret sauce for those loads. I cannot imagine that they wouldn’t buy that ammo and test it in their gun.

 

Not yet.

 

My G20 eats whatever I put in it.
From .40 s&w to 200gr Underwood hollow points.
It is a Gen 4 though but I wouldn't think there should be that much difference.

 

My G20 eats whatever I put in it.
From .40 s&w to 200gr Underwood hollow points.
It is a Gen 4 though but I wouldn't think there should be that much difference.

It seems like a lot of people are having problems with the Gen 5 specifically.

 

My Glock 20 gen 4 with kkm barrel and stock springs eats Underwood 200 & 220gr hardcast like candy. Reading all of your troubles, I'm glad I bought a gen 4.

 

OP, I'll give you tree.fiddy for the Gen5 G20.

I have been able to put rounds through a friend's Gen5 20 with no issues

I have a Gen3 20, and Glockzilla that eats everything and .40.

I also have a Mp2.0 best millimeter that eats everything. I did get it early on and had feed issues, however SW gave me replacement mag springs and it meow functions flawless as my glocks.

Not all things created equal there may be an issue with yours. You could attempt to polish like someone else stated, or maybe contact glock for warranty.

 

OP, I'll give you tree.fiddy for the Gen5 G20.

I have been able to put rounds through a friend's Gen5 20 with no issues

Which rounds?

 

I wouldn’t mess around too much with this. Call Glock and tell them what the problem is and what loads you are using. They will send you a label and have it back in a week or two. Sounds like it’s their problem. The loads the OP is trying to run sound perfectly reasonable. The G20, particularly the latest generation, should be able to handle this with ease. My G20 Gen 3 has been flawless, including my hot rodded hand loads. A Glock that can’t handle a commercial load needs to go back, end of story.

I’ve been curious about the new Ruger carbine in 10mm. A full power 10mm load out of a 16” barrel is no joke. Anyone have one?

 

First and foremost, change the magazine springs to stronger ones from Wolf. Seems the later stock G20 mag springs are extremely weak as if they also use the same spring on the 10 round magazines and it is tuned to work with 10 rounds and not 15 rounds.

If that does not work but I bet it does, you can polish the inside of the chamber as it may be catching on a rough spot. I do this with all my 10mm barrels to ensure perfect and reliable chambering. I focus on the top of the chamber, edges, slightly radius and polish above the feed ramp as it transitions into the chamber, and sides. While I'm in there, I polish the feed ramp even though there is not much contact with the 10mm.

In addition to the above, I use stronger RSA springs. When you are using higher powered loads, you will really need the extra strength RSA as it will help absorb the impact instead of the frame absorbing. It will also help the rounds push into the chamber.

 

My gen 5 gave me fits trying to get it to run with heavy hot loads, my setup now is a KKM barrel with a KKM comp and a 17lb RSA.

 

Which 17lb RSA? Isn't that the stock weight?

 

could the hotter loads be forcing you to limp wrist?

 

No.

 

Tested the remaining four DPM RSA configurations. None of them worked. That's a total of 11 different RSA configurations/weights, if anyone's counting.

Pistol is on its way back to Glock now. I'm not optimistic that they'll fix it, but I feel I should give them the chance, and at least they're getting this feedback about the sorry state of their product.

I'm more optimistic that the extra power magazine springs and/or the KKM barrel, when I get them, will help me to achieve functionality. (In combination with one of the RSA configurations that I already have on hand, of course.)

What a mess 🙄

 

Tested the remaining four DPM RSA configurations. None of them worked. That's a total of 11 different RSA configurations/weights, if anyone's counting.

Pistol is on its way back to Glock now. I'm not optimistic that they'll fix it, but I feel I should give them the chance, and at least they're getting this feedback about the sorry state of their product.

I'm more optimistic that the extra power magazine springs and/or the KKM barrel, when I get them, will help me to achieve functionality. (In combination with one of the RSA configurations that I already have on hand, of course.)

What a mess 🙄

I run 22 to 24lb in my 10mm’s running full powered loads. What strength are you running?

The KKM barrel will most likely be worse as the chambers are tighter than Glock. Next step is to polish the chamber area and feed ramp.

 

I think the issue is one of timing of the feed cycle, not a problem with the barrel. A heavier recoil spring may slow the rearward phase of a slide cycling but it speeds up the forward portion. I think the fix (if there is one) is a heavier magazine spring much more so than a heavier recoil spring. That being said, I’ve had no trouble between 3 G20’s, but that doesn’t mean the problem doesn’t exist. If I had trouble the first thing I would do is shoot ammo from one of the majors (Federal solid core comes to mind). If the trouble persisted I would use a heavier mag spring before changing recoil springs.

 

Glock 10mm Bear Loads jamming.
Here's an interesting thread from the Fire - Mackay Sagebrush is Ted McIntyre of Lost River Ammunition Company.

https://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/19816780/re-glock-jamming-during-bear-attack

 

If this is the article in one of the threads on that other forum, I can't presume to gainsay the observations or opinions of the author.

Hunter’s Pistol Jam During Grizzly Attack Could Have Been Because Of Ammo, Grip

An archery hunter’s Glock pistol jamming on him twice during a Wyoming grizzly attack Thursday could have been due to a variety of factors. But gun…

cowboystatedaily.com

 

@MH2024_Glock
First, no disrespect intended.

How many rounds have you fired through this G20? My daughter's 320XTen choked on UW 200 WFN HC. It would hit the feed ramp and just die halfway. She bought around 400 rounds of whatever range ammo she could find and we shot it. No problems since.

Good luck in your quest