Primers extruding into firing pin hole

[Sledgehammers_at_Dawn]

I?m not new to reloading but am new to the 10mm. I?ve loaded several rounds of cast, powder coated and resized rounds. I usually start a little above minimum load in several different manuals. I?ve never had a problem with primers extruding into the firing pin hole. I reduced 700x to well below the start data until it stopped. Went to 9.0 grains Acc.#7 extruded. Bullseye 5.5grns. No extrusion, staring weight. 6.00grns. Bullseye extruding again.
I used two different primers CCI and I believe Winchester large pistol. I use a Lee FCD.
OAL is correct. Numbers on crimped case mouth are good.
Any thoughts?

[Graybeard]

Welcome to the forum
I think a little additional information is necessary. Which bullet and weight are you using? What diameter are you resizing to? What are the OAL and crimp measurements? Regarding the "extruding into the firing pin hole" description, the firing pin dent is completely reversed and is now a raised area formed to the hole in the breech face? Are the primers completely flattened, as well?

This really sounds like an over pressure issue. How did they feel when you fired them? Any chronograph data?

Edit: Sorry the picture didn't come up when I first saw this post. It's a little out of focus, but very odd that the extruded primer doesn't appear to be flattened. A little flattening is normal for hot 10mm loads. The rounded edges of the extruded primer don't appear to be flattened at all, correct?

[Sledgehammers_at_Dawn]

Thank you for the quick reply. I used two different bullets, both powder coated and sized to .401. One Noe 402-188-WFN-BV1 hollow point, weight 170grn. And a Lee 401-175-TC weight 174grn.
1.260 OAL, .422 crimped case mouth.
Would cratering be a better term? I saw some flatness to the primer on the face but the edges are still round.
No chrono yet. It will be on order later today. They felt a bit snappy. A little more so than some older Federal rounds I had from ?98. The starting load of Bullseye is less snappy and the published pressure is 2,000 C.U.P. less than 700x.
I wanted to get this solved before going to jacketed bullets. It looks like I?ll load a couple of them and see if the issue is with the bullets. Also will try a few rounds in another pistol. A Kimber 1911. I?m shooting a Ruger 1911 commander.
Sorry for the bad picture. That?s how I usually see things that close:-) looked normal.

[The_Shadow]

Sledgehammers, what you are seeing is called "primer wipe", this is caused by the action opening while the pressures are still up there.  As the action starts to open the barrel will tilt downward and the primer is still hard against the breech face as the case slides down it rubs against the firing pin or striker hole shaving off some primer material.

The dwell time of the barrel locked into the slide can be change on some guns with a heavier recoil spring.  On 1911 styles the Flat Bottom Firing Pin Stop and even the main spring are to work in unison to help on the 10mm guns.

Also be aware that the small bits of shaved primer cup can deposit inside the firing pin or striker channel and that build up can pose issues if not cleaned.

[Graybeard]

I think Shadow's on the right track here. The interesting thing is that CCI primers are generally considered harder than Winchester primers. The gold colored primer in the pic (winchester?) looks normal. The condition Shadow has described would also include some firing pin drag. So you should see an oblong dent, rather than just a circular one. My XDM10 does a little of that no matter how much I upped the recoil spring. None of my 10mm 1911s do.

Lucky for you there are lots of spring options in the 1911 world to rectify the situation, as well as a FBFPS.

If it were me, I might be tempted to prime some brass with a couple of Winchester primers and a couple of the CCI primers from that same batch and fire them empty in the same gun. The purpose being to see if the dent is roughly the same or you got an unusually soft batch of CCI primers. I'm anal about such things, so I'd inspect the mainspring to make sure it's intact and you're getting the same tension each firing.

[Sledgehammers_at_Dawn]

Thank you for the input.  Because of my picture taking ability, it?s hard to see, but both primers have ?craters ? primer metal raised higher than the surrounding metal. Should a new gun have this problem?
I have some hotter loads I need to try. Trying to get my dad to let me use his Kimber;-)
I?ll let you all know how it goes.

[Sledgehammers_at_Dawn]

No crater using the Kimber. Another poor picture of crater with  Blackhills 180grn hp.
There is a noticeable ridge on the primer. Would this be wipe?

[The_Shadow]

The hole in the breech face may be a little large allowing some of the flow back as well.  Your load may change the dynamics as well.
What powder are you using for you given loading?  Faster powder (Bullseye) tend to snap the case and primer with the faster pressure curve.
Slower powders may help your situation some as well. 

[Graybeard]

That Blackhills case may show the teeny tiniest amount of firing pin drag, but not primer wipe. Shadow is probably right, the combination of a larger firing pin hole and faster powders is the culprit in the first picture.

There is just a hint of flattening on that primer, too. Not a problem, but it would seem to have been a higher pressure round and the gun didn?t unlock early. So that?s a good thing. You might be better off saving that 700X and Bullseye for .38sp and .45acp.

Bluedot, PowerPistol, AA9, Longshot, etc, all work really well in 10mm.

[Sledgehammers_at_Dawn]

Thank you Graybeard and Shadow. I?ll try PP and Blue Dot.

[CtYankee]

Your primers still have rounded edges, so I don't think the pressure is too high. As The_Shadow suggestes, I think it is a matter of the firing pin hole in the breech face being a little too large. My Beretta 92 has shown similar marks for about 20,000 rnds and still runs fine.

[sqlbullet]

That looks like a firing pin hole that is larger than spec for the size of the firing pin. I would guess someone screwed up and put a firing pin for a .065 or .075" firing pin hole in a slide for a .090" firing pin.  Ed Brown sells three different sizes specifically to address this issue.

https://www.edbrown.com/product/1911-firing-pins/

[Sledgehammers_at_Dawn]

Thank you all for the help! I?ve heard that Remington had the same problem with the larger firing pin hole. I thought I was going to blow up my pretty gun! I?ve sent a couple of emails to the shop I bought it from. And gotten no response. I?ll be hanging on the phone which them when I get the chance.
I have time on the weekends to reload. Loaded some rounds with Power Pistol and had the same issue. Nice fireball!!