Hi, hoping to get some help on a jamming issue I keep having with my Glock g20 5th gen. It only happens when I shoot the underwood hard cast 200 grain bullets. I swapped out the guide rod and spring to a 22lb and it’s still happening. Has anyone else had this problem and were able to fix it with something else? I’m wondering if it maybe has something to do with the magazine, but it’s the factory Glock mag and I’ve never had problems with them in any of my other glocks. Trying to be more responsible this year with grizzly bear safety while bow hunting and running out of time unfortunately.
Quickest fix would be to try a different outdoors load - you might consider this one:
https://www.buffalobore.com/index.php?l=product_detail&p=117
I would also swap back to the original recoil spring setup - if you don't have time to thoroughly test and tune a new spring in a variety of conditions, temps, etc, it's by far going to be the most reliable system for the widest variety of loads and conditions.
Several guys here have mentioned limp-wristing. Two points on that - one, is they may be right. And you don't want to be carrying a gun/ammo setup that requires focusing on not limp-wristing if you're being actively attacked by a predator, possibly even firing one-handed and/or on your back. You want it going bang from any angle, concentrating on grip/wrist-lock or not.
The second point is that the problem of "limp wristing" malfunctions often go away with a
good lubricant, thoroughly applied. It's particularly a problem with heavily-sprung guns, even moreso for female shooters with weaker wrists - think subcompact .45s and .40s, with heavy spring systems. At the core of what's going on with limp-wristing is that the slide has to move rearward at a sufficient speed to eject the casing, and forward fast enough with enough momentum to strip the live round off the mag and chamber it firmly. When you get malfunctions you describe, it's almost always because the slide isn't going forward fast enough. Often, that's because it didn't get enough energy into its recoil spring as part of the backward-moving part of the cycle. That can happen with heavy recoiling heavily sprung guns, if the wrist isn't firm enough to allow the slide to go back as far and fast enough to compress the recoil spring with enough energy to fling the slide forward again. A good lubricant can remove enough friction to help overcome that in a lot of cases. I've personally seen both TW-25B and the cherrybalmz Black Rifle Balm eliminate limp-wristing malfunctions in a couple of CCW guns women have been shooting in classes. Between that, going back to stock springs, and possibly a different load, and you should be able to dial things back into reliability. If nothing else, any .40 FMJ should be able to penetrate enough into a bear to get to the vitals, and it's a situation where reliability is far more important than having the hottest, most perfect load to shoot.
