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!!

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

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?

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.

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.

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?

Hi all,
I?ve been lurking for some time and didn?t see the answer to a question I
had about my newly acquired 10mm.
From ND. I reload and cast my own bullets. Just started powder coating. I hope to
get some good advice from this forum.