Posted: 8/11/2010 7:28:49 PM EDT
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This problem recently cropped up and I need to make sure I'm going in the correct direction.
I finally got some 200gr XTP loads worked up after a year long shortage. Loads are 1.26 OCL, plenty of crimp, and all drop in and out of the chamber without issue. In a ten round mag, these loads cycle fine. In three fifteen round mags, approximately half the rounds fail to feed - ending up w/ the cartridge wedged at a 45 between the very bottom of the slide and top of the chamber. If I ride the slide, all rounds will chamber in the 15 rd mags. Initial instinct tells me that it's the mag spring. The 200gr loads being heavy enough that the spring isn't pushing the rounds up quick enough to be fully picked up by the slide. Before I order a few +10% springs, anyone else have any other ideas? Other guns specs: -All mags have #2 followers -LWD barrel w/ the chamber opened up by LWD -Same results with stock, 20lb and 22lb recoil springs. |
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Quoted:
I don't believe what you are describing is a "gun" problem as much as a "barrel" problem. Try feeding the rounds through all magazines with the "stock" glock barrel, then let us know. Yes, everything feeds through the stock barrel due to the generous chamber. The LWD barrel did have feed issues early due to the chamber, but was corrected and this is the first feed issue I've had since. I'm leaning away from any barrel related issue due to the fact that 180gr XTP loads, in addition to every other 10mm load I have (SWC, TC, Etc), cycles without issue in the LWD barrel. The 180gr load is dimensionally the same as the 200gr load, with the same OCL, crimp, and bullet profile. The only difference being the extra 20grs. |
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Sure they're not just weak loads causing a short-cycle of the slide? Maybe enough to catch the rear of the casing, but not enough to come back and catch the lip? The 15rd's have a stronger spring i believe, and this may be causing the top round to drag more on the slide slowing it down. Just a thought... |
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Quoted:
Sure they're not just weak loads causing a short-cycle of the slide? Maybe enough to catch the rear of the casing, but not enough to come back and catch the lip? The 15rd's have a stronger spring i believe, and this may be causing the top round to drag more on the slide slowing it down. Just a thought... Nope. 200grs @ 1210FPS. The problem occurs when the gun is fired, as well as, when the slide is cycled manually. |
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Gotcha, sounds like something is causing the rounds to hop up at too steep of an angle too early. LW opened up the chamber, but did they adjust the feed ramp at all? Sounds like the feed ramp is too steep for that particular round and I can almost guarantee that it would function with the stock barrel, but i know you have your reasons for the aftermarket barrel, including brass life... Have you tried the stock barrel recently? it might rule out the mags as the cause... |
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Quoted:
Gotcha, sounds like something is causing the rounds to hop up at too steep of an angle too early. LW opened up the chamber, but did they adjust the feed ramp at all? Sounds like the feed ramp is too steep for that particular round and I can almost guarantee that it would function with the stock barrel, but i know you have your reasons for the aftermarket barrel, including brass life... Have you tried the stock barrel recently? it might rule out the mags as the cause... The loads will hand cycle through the stock barrel without issue. I may be to kind when I say the chamber is generous. I have no plans to fire these loads in the stock barrel as brass life is only one firing. Yes LWD worked the chamber and ramp. Don't know about the ramp being too steep, as the 180gr load with the same profile feeds fine. Another interesting fact is that when hand cycling - if the slide is returned to slide lock each time and then released, the rounds feed fine. They only hang up when manually racking the slide. Which again makes me think the mag spring takes a split second extra to get the round properly placed to feed... |
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Been there, done that. Per COSteve, I had to 'break the bead' on the lwd barrel to get rounds to feed, but this was w/all mags.
I rounded the hood of the lwd barrel since the rounds were hanging up there but not leaving a mark. If you choose to do this I am not responsible for any damage.please understand what you're doing before you ever take a file to a gun! A few strokes at a time will do it. COSteve may chime in later; I believe he has pics. Good luck. Posted Via AR15.Com Mobile |
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With my first G-20 I had a similar problem, it ran fine with 10 rounders, but when we finally got 15 rounders after the ban expired, I would get failures to feed. The cartridges wouldn't funnel up to the feed lips properly. The noses would all come up to the lips, but sometimes the rims would jam up and not get up tight against the lips.
The stripper rail would then strike the side of the cartridges and not the rims, jamming the slide. It would leave shallow dents in the sides of the brass with a small scrape mark from the dents toward the nose. Try this, load a magazine with at least 6 rounds, push down on the rounds and let them spring back up to the feed lips, if they don't always come up with the top round flush against the lips, this may be your problem. I never did figure out how to correct it other than using 10 round mags, that's one reason I sold my first G-20. But I'm a gluten for punishment, and I just got a 2nd gen G-20 off Gunbroker, barely used for $440. |
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Quoted:
Quoted:
Sure they're not just weak loads causing a short-cycle of the slide? Maybe enough to catch the rear of the casing, but not enough to come back and catch the lip? The 15rd's have a stronger spring i believe, and this may be causing the top round to drag more on the slide slowing it down. Just a thought... Nope. 200grs @ 1210FPS. The problem occurs when the gun is fired, as well as, when the slide is cycled manually. Sounds like a bullet problem. Those bigger bullets' geometry have a larger profile that isn't wedging into that tighter barrel smoothly. Either that or you're not seating the bullets deep enough into the case, but I'll assume you know what you're doing with your length gauging. This isn't a spring problem, or it actually would (probably) happen with the smaller bullets. |
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We shoot our 10mm Glocks often (G20/G29) and have found the G20 (especially w/LWD barrels) to be nearly as picky about ammo as HK's w/locking pieces (Okay, nothings that bad)...you've got to find the right ammo not screw with the weapon. I'm running nothing but DT's and Win Silvertip 175's; expensive but this IS 10mm shooting and it's not for those averse to spending $$$ on ammo.
On the other hand, I've been there too. Sometimes you've got to MAKE it feed a particular ammo...period. Just my $.02 |