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Flattened firing pin indention

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Give Ruger a call.

The firing pin was not in contact with the primer at peak pressure. The action may have opened at little to soon?
Or pressure pushed the firing pin back. In a revolver, it's called " hammer bounce" Not a problem, unless a small piece of the primer blows out & enters the firing pin channel.

an extremely small hammer that slaps a lightweight firing pin
Click to expand...
May be why?
https://www.gunsandammo.com/editorial/ruger-57-pistol-review/386213
 
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Thanks for the information! The firing pin looks pretty blunt but I don’t remember what it looked like before. The pistol didn’t do this before, I have a habit of looking at the primers and spent cases of everything I shoot and never noticed before.
The gun isn’t very old and has already been back to Ruger for a new trigger bar. I wonder if I just got one built on a Monday.
I have the Security 9 also, which has the same trigger mechanism and it’s been utterly reliable.

1CC623A7-ACAA-4697-A088-88811F74AD03.jpeg
 
test the firing pin with a sized primed (dead) case without powder or bullet. Then you can get an idea of what the pin is doing!

dead primer make by punching out the used primer indent
 
twarr1 said:
Curious about this. FN 5.7x28 commercial ammo fired in Ruger 57 pistol. The firing pin indention is flattened. Any ideas?


View attachment 1073258 View attachment 1073259
Click to expand...
of your dead primer pin test results in a nice looking primer strike. Then these photos are pressure signs

Flatting primers and cratering = Over Pressure

I’ll take a look at my Ruger 57 tonight to see what the pin looks like. I have not fired it yet. I’ll post photos
 
Thanks! Question resolved. The photo in post 4 of the ‘end’ of the firing pin wasn’t the end of the firing pin. When I pushed the pin forward, a tiny piece of metal (plating? Copper?) fell out. Now the firing pin looks normal. Odd, since the first thing I did was clean the bolt face, scrub it with a bronze brush and pushed the firing pin back and forth to make sure it was clean and free.
70F4258E-0363-4366-A6DF-04A8F944D44E.jpeg
i can’t hold the slide, push the pin forward and take a photo at the same time.
 
243winxb said:
Called a Blanked Primer. A fired primer cup in which the firing-pin indent has been punched out by internal gas pressure. Should leave a hole in the primer.

If the metal makes it back into the firing pin channel, will cause misfires.
Click to expand...

@243winxb for the win.
While looking through the spent cases from last weeks outing I came across this:

038A999A-C1FB-4EC2-9AA3-E69F226B27DE.jpeg

Removed primer:
FF5A4ED2-FBDA-49ED-92DC-B0BF65D88D66.jpeg
 
Byproduct of running more than 50,000 psi doesn’t seem as likely as the wrong or bad primer, as there are a number of others that don’t seem to have the problem. If a number of brands of ammunition and or, say CCI primers, I’d say it is a problem with the pistol.
 
Excessive slop between the FP and FP hole will cause it. On a small dia hole you only need 0.001-0.0015" clearance. I had a bolt for a AR10 where the clearance was over 0.003" and it would do the same thing and pierce primers about 40% of the time on my 6.5CM. The mfg sent me a replacement and it was worst than the one I had. Found out that is what the mfg spec are. I ended up machining it out and fitting a bushing into the bolt to correct the problem. I will not or recommend that mfg for parts.
 
Maybe the pic, those look like really poor cartridges: cracking around the edges, lumpy and bumpy, etc. Who made them?
 
Dave P said:
Maybe the pic, those look like really poor cartridges: cracking around the edges, lumpy and bumpy, etc. Who made them?
Click to expand...
All my cases are FN. But I read they’re actually made by Federal. I tried some Federal 5.7 but the very first one came apart on chambering. Federal took those back.
 
twarr1 said:
All my cases are FN. But I read they’re actually made by Federal. I tried some Federal 5.7 but the very first one came apart on chambering. Federal took those back.
Click to expand...
we should try some CCI 41! nice hard primers
 
Mark_Mark said:
we should try some CCI 41! nice hard primers
Click to expand...
I saw a study where the 41’s had the worst consistency of all the primers tested. Probably not so good in a cartridge as sensitive as the 5.7. I have published data calling for both SPP and SRP. Maybe I’ll save the Federal SPP for something else and stick with CCI 550.
If you try the 41 please let us know!
 
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