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View Full Version : PM40 Range Report / Fail to Feed



CalBig
06-14-2011, 12:25 AM
I picked up my new PM40 on Sunday, and have now taken it out to shoot twice. Having done a lot of reading about the PM40 I was a bit apprehensive. I have always purchased firearms that have a reputation for flawless operation and have only ever had one problem in the past (extractor issues with Ruger MkII / 10/22 known issue, fixed by replacing extractors in both). Comparing the PM40 against any of my other centerfire handguns probably isn't fair. Comparing it to others experiences with pocket guns, it does well. My thoughts.

Size: Damn small. My hands are big. I was worried about being able to hang on to it. This has turned out not to be a problem. It is perfect for what it is in this area.

Trigger: Smooth break: 10. Reasonable weight: 8. Length: 2. The smoothness and weight of the trigger are great for a carry gun. Not going to cook off a round by accident, but can get accurate shots on target. The pull is just so long though. As much as I am not in love with the glock trigger, I think they have done a slightly better job with adding a crisp break at the end of the moving of the striker to the fully cocked position.

Recoil: Not as bad as I expected, both with powder puff range loads and my self defense loads. This is totally functional. I'm not likely to punish myself by putting hundreds of rounds per range day through this weapon, but practice is not a miserable event and accurate follow up shots are not a problem.

Reliability: I had a number of the issues that have been described by other posters during break-in (fail to feed, slide lock back when mag not empty, difficult to eject mag) but after firing about 150 rounds through it, cleaning it, and firing 50 more, I only have one issue remaining. I'll describe it.

Using the 6-round mag (5-round works fine) and PMC Bronze 165gr semi flat nosed FMJ rounds, the first and second round always fail to feed. The stronger spring in the 6-round mag causes the round to hang up just slightly exiting the mag, causing the nose of the round to tip down and the extremely steep ramp plus the semi flat nosed round equals fail to feed. The 6 round mag combined with my grip also contribute to the issue because the mag sits low in the gun. Palming the rear of the slide doesn't usually help, but tapping the mag hard usually does. My self defense rounds (Hornaday Critical Defense) feed fine. They are a VERY sharply pointed round and looking at the angles involved it's clear why they feed so much better on the Kahr feed ramp. Ramp is polished and very smooth. It's not very wide though, and it's very steep.

I intend to try some different ammo. If I can't shoot flat nosed bullets in this pistol I think that will end up being fine for me. It's unfortunate since all of my other center fires feed anything and everything (HK USP Expert 45, USP Compact 45, Springfield XD 45, Glock 23 (.40 cal)).

Any oddball thoughts that might allow me to clean up this one issue? I'm guessing it will just be a quirk of this gun, which is probably OK. It's also really too bad that the trigger is so long. Overall these are issues that I can live with in what I think will turn out to be a very useful tool for a very specific purpose (carry when the Glock 23 is too big).

-Adam

TucsonMTB
06-14-2011, 01:16 AM
Welcome to the forum!

Your thoughtful first post mirrors my experience as well. The 6 round magazine is not as reliable as the carry magazine with the ammunition that I favor either. In my case, the 135 grain Winchester Ranger JHP that I favor for practice works well in both. Only my carry ammo, 155 and 180 grain Winchester Ranger JHP are sporadically problematic in the 6 rounder.

The two things I have done that have helped the 6 round magazine's performance are:

1. Sand a greater clearance into the follower to prevent it from hitting the magazine catch. You'll know you have eliminated interference when the follower will fall without restriction from an otherwise empty magazine tube inserted into the pistol. For me this eliminates nose dives by the second and third rounds. I found it useful to modify all of my magazines. You will find that modification well described in this thread http://kahrtalk.com/showthread.php?t=1612 created by Greg (gb6491).

2. Sand the top of the follower to provide greater support for the front of the round. You will find that well described in this thread http://kahrtalk.com/showthread.php?t=6943 also created by Greg (gb6491). For me this not only helps with the first round but seems to eliminate most three point jams. I took sanding the top a little further than Greg. I make the top match the shape of a .40 S&W round better than the stock follower, which looks closer to the shape of a 9mm round to me. YMMV ;)

jocko
06-14-2011, 08:07 AM
cal big: go tothe kahr tech section and hit ohn propper prepping of yournew kahr, it will tell u about that 2 and3rd round hang up and then also another stick6y with great photos is the cw45 fixes by gb67491. He shows how to take care of that rou8nd sticking thing. It is correctable . read those two sticky's and you will be OK..

Red Alert
06-15-2011, 02:52 PM
Hi, I just joined. I've owned my PM40 for a couple of years and I've experienced a few problems during the break-in period. Interesting info above on working over the magazine followers to improve feeding.

I've had no problem with ball ammo feeding properly, but encountered serious issues with Critical Defense ammo hollow points. They would always FTF properly on the second or third round. I'll see what happens after I hand work the followers in the mags. Because of the FTF problems, I found that Corbon PowerBall ammo was very reliable and had no FTF. That is the ammo I currently carry in my Kahr.

During range sessions, I experienced a battered trigger finger. Sore to the point that 30 -40 rounds in a shooting session was all I could handle. I sent it off and had it mag-na-ported. Much better. Still get the occasional bite on the trigger finger, but overall it is now acceptable.

I'm considering selling my PM40 to fund a purchase of a Sig P239. I know the Sig is larger, but it has a DA/SA trigger that I prefer to the Kahr's DAO.

Until I do make that purchase, the Kahr is my daily carry.

Red

TucsonMTB
06-15-2011, 08:33 PM
Welcome to the forum, Mr. Red Alert!

It's always good to see another PM40 shooter. Jocko is also a fan of ported pistols, but I am not yet convinced. I probably need to shoot one, I guess. In the meantime, a fabric Band-Aid on the first knuckle works for the 100 rounds or so in my typical range sessions with my PM40.

I suspect the short action of the PM40 makes it more ammo sensitive than other Kahrs. Certainly, my CW40 will eat anything. But, my PM40 is a picky eater not fond of longer cartridges with wide noses. Oh, well. I've settled on Winchester Ranger 155 JHP for carry. I usually load a single 180 grain Ranger in the pipe, since they occasionally "Fail to Feed", usually a "three point jam".

If you have a good running PM40, you might want to hang onto it, at least until whatever you select as a replacement makes it a genuine "safe queen". Just my two cents since most of us have to invest real time and money to get a PM40 working well. ;)