Keltec PF9. Shaving primers.


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atblis
February 7, 2010, 11:44 AM
I have a Keltec PF9 that has been giving me some issues. Just wondering if this is a known problem.

I've had two failure to fires in ~200 rounds. I am 99% certain they are due to the fact that primers are being shaved off in the firing pin hole and leaving brass shavings in the firing pin chanel.

I am shooting my handloads, 5.7 gr of Unique, mixed brass, 115 gr Precision Delta FMJ, Winchester SP primer. OAL is about the longest that'll fit in a magazine (don't remember the number).

I do plan on trying some different loads. These loads aren't anything too weird, but thinking it could be a timing issue. The PF9 is a very compact pistol, and short pistols are a little weird about timing sometimes. Maybe a slightly faster powder, and the problem will go away?

FWIW, those handloads chrono at 1220 fps out of a G26. 1270 fps out of a full size gun. They're not wimpy loads, but are below published max.

The pistol has been great otherwise.

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Dolph92
February 7, 2010, 12:22 PM
Are the primers showing any signs of over pressuring? Do you have an image of the primers and of the firing pin channel and hole? Remember what you get out of one load in one firearm may not be the same across other firearms. Its very possible these loads while under max load are high in pressure given the chamber and barrel configuration of the Keltec??

Nasty
February 7, 2010, 12:26 PM
Does it do it with fresh commercial ammo?

Number 1 question in my opinion.

atblis
February 7, 2010, 03:49 PM
Does it do it with fresh commercial ammo?

Number 1 question in my opinion.
That's something I've been meaning to try. I just haven't been able to convince myself to buy factory ammo. :) It's hard to make myself pay more than double for something I consider inferior.

Nasty
February 7, 2010, 04:24 PM
I think you'll need to as a diagnostic tool.

Way too easy to blame your stuff otherwise.

I assume you've done at least a good clean/lube...perhaps even fluff & buff?

Either way...check your bolt face to make sure you have a smooth and flat surface at the firing pin hole. There *can* be a burr there, either from the factory, or as a result of dry firing (even if it was someone else doing it).

wnycollector
February 7, 2010, 04:29 PM
As painful as it may be, you might have to swallow your pride and trek to wally mart and pick a nice box or two of wwb. Changing that single variable will allow you to figure out if its the PF-9 or your load.

evan price
February 7, 2010, 10:28 PM
I took a small sharp drill bit, and, by hand, spun it on the firing pin hole in the breech face a few times to make a countersink to keep this area clean. YOu can hardly see it in the gun, but the fired brass you can see the mark.

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