Hello all, I value your expertise. Any help you provide will be appreciated.
My 9mm Wilson Combat CQB occasionally (3 out of the last 100) feeds a round nose-up, like a stove-pipe with a loaded round. These only seem to happen with my reloads. My load is:
147 grain plated RN
3.4 grains Titegroup
1.14" OAL
Mixed, multi-fired brass
Any thoughts on what causes this type of malfunction?
Have you tried seating longer? Most 9mm 147's are loaded longer...
Hodgdon shows a very short 1.100" with a JHP but if you look at the FMJ the run a 1.169", this is so they will have the most room for powder with this long bullet.
Here is a suggested COL for the 147's
(http://i1086.photobucket.com/albums/j441/_The_Shadow/9mm-COAL_zpssijqgbte.jpg)
You might want to work with a little more powder even at 3.6 grains that shows a 27,500 CUP far short of the SAAMI Maximum and even further from the proposed pressure limit of 38,500 p.s.i +P rating.
I will try longer OAL. Been using 1.14 for a while without this type of failure though. Yes, it's a really light load. Has worked okay until now though.
Is this different magazine? If the same is it possible it got damage? or the lips stretched outward?
What about Slide lubrication? The slide being dry could slow things down...
How many rounds on that recoil spring use? Is it time to change?
Just some things to look at...
Good luck! ;)
Same mags.
Possibly damaged. I'll inspect.
The mags (15 or so) have seen between 500 and 1500 rounds each likely. I'll look them over closely.
Fairly new 10-lb recoil spring (1000 rounds on it possibly).
I think maybe My 3.4 grains was possibly more like 3.3 or so. It's right on the edge of not functioning anyway. Mgonna try a little more powder and a little more OAL. Many thanks!
As ad added data point, I shot 1025 of these rounds from this gun in 2014. Six of them failed to eject. I assume due to the weak loads. There were no other failures of any kind. These were well spread out across the year both before and after swapping main and recoil springs for new ones.
Of the 475 fired in 2014, I have had seven failures. One round did not load from slide-lock, two did not eject, and four went nose-up. All these failures have occured in the last 225 rounds from the same batch of reloads.
I can live with 0.6% failures to eject when I have a good idea what is causing it. It's the nose-up failures that are bothering me.
Quote from: Denver1911 on April 02 2015 06:20:27 PM MDT
Hello all, I value your expertise. Any help you provide will be appreciated.
My 9mm Wilson Combat CQB occasionally (3 out of the last 100) feeds a round nose-up, like a stove-pipe with a loaded round. These only seem to happen with my reloads. My load is:
147 grain plated RN
3.4 grains Titegroup
1.14" OAL
Mixed, multi-fired brass
Any thoughts on what causes this type of malfunction?
(Just a guess)
I would look for a broken, chipped or dirty extractor. If the base of the cartridge can't slide up past the extractor claw, the front of the cartridge would pivot upwards as the slide moves forward. If the firing pin was protruding from the breach-face, the cartridge might not be able to slide up. Disassemble the slide, clean everything, and check for broken, worn, or chipped parts. A weak firing pin spring may also cause the pin to protrude from the breach-face: dirt would exacerbate the problem. You may also want to replace your recoil spring.
Besides that it could be the lube or the magazine.
.
I have a Wilson CQB in 45ACP. These guns are very tight. Hand fitted slide to frame. They are know to be picky as to what they will feed. All the advise is right on.. Also make sure the slide to frame is well lubricated. As I recall your gun should have come with Wilson grease.. It will be a combination of all the above comments to find the sweet spot..
Update:
Got back to the range today. 100 flawless rounds at 3.5 grains Titegroup and 1.165 OAL. Shot 25 Speer Lawman 147 grain flat-point factory rounds as well as 10 Montana Gold CMJ over 3.5 grains Titegroup and 5 Black and Blue 147 grain coated FP over 3.5 grains Titegroup. All functioned 100%. I only took five magazines so maybe it's a problem with one of the mags I left at home. I'll keep an eye on it. Looking back, I think the 3.4 grains of Titegroup was probably a little under-thrown (maybe 3.2 or so) and I need to keep my OAL at 1.16 or so as well as doing a little better QC.
Thanks all who helped provide useful info. If I have more problems ... I'll be back. If I find the source of my problem as something other than the short, weak rounds, I'll share.