I have to eat some crow. Kimber just sent me a video.
After they were unable to replicate the issue in a test firing, they then ran through 80 rounds of Winchester 175gr JHP. Flawless. Here's the video:
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(Pretty cool to have the job of just shooting guns all day)
I don't expect them to bill me, which just further highlights how incredibly good their customer service is, and their commitment to "making it right" for a customer.
The mags we used were the ones shipped from the factory, and then two extended Tripp mags. Now that they are back in stock, I am switching to Wilson Combat, even if Tripp is from Texas. I don't think the mag caused any issues. I think my nephew was limp-wristing it. 10mm is probably the most powerful round he's ever fired by a wide margin. He's fired some 357 Sig, 45 ACP, 38 Super, but most of his experience is with 9mm and 40S&W.
So, basically, I feel like an idiot. I let all the chatter and negativity about Kimber shake my confidence and I assumed it was the gun and not the shooter. I don't blame him either, he doesn't know, he just doesn't have the experience. I am responsible. I just wrote back to them offering to pay the cost.