Dramatic sky, eh?
Home by noon. Off to the range by 1:00. Fired 150 rds of Remington 230-gr JHP through the Kimber, then 20-rds of 230-gr Hydra-Shoks. Had a FTE on rd #3 with the Kimber mag and another on rd #76 with a Wilson 47OXC mag (!). No other failures. No failures with the Hydra-Shoks at all, but it was only 20-rds; those things are pricey! Used six mags: Kimber, Pro-Mag COL1, Tripp 7R-45-WO, two Wilson 47OXCs and a Wilson 47OX. All mags worked well. The cheap Pro-Mag was a pleasant surprise: no failures at all, and this mag has a skirted plastic follower and a little "pinkie rest", although it holds only six rounds. The Tripp mag is built like a Mack truck, but the Wilson 47OXC mags worked beautifully AND loaded like butter; they just felt like "quality" - I think I'll stick with the Wilson 47OXCs. The Wilson 47OX is the same mag but with a larger base plate. That makes a total of 520 rds through the Kimber and it shoots very accurately, for me anyway!
I have "retired" the other two magazines, the Chip McCormick and the Wilson 46. They are both high-quality mags, but not for an alloy receiver like this Kimber.
Also put 100 rds of 10mm through the Witness. Had four or five failures-to-feed: the round got caught on the feedramp. Three factory mags in use here, so a defective mag seems unlikely to be the cause. I polished the feedramp last week using 400-grit sandpaper wrapped around a 3/8" wooden dowel, finishing with 600-grit, then a GENTLE polish with jeweler's rouge and a felt "bullet" on a Dremel (I know, I know! But lightly and gently.)
Check out the firing pin impressions. It looks like the firing pin still hasn't retracted when the casing starts to eject. All of the 10-mm rounds looked like this. Maybe some new, stronger recoil and firing pin springs would be in order; the Witness still has the stock springs. The Kimber's firing pin impressions were perfect; no smears or "commas" there.
Then out to the back porch with the laptop in 66-degree weather (yes!) to write this post alfresco! Coffee with whipped cream, a Drambuie and a fine cigar ... life is good!
You know what else is good? Arriving at the range with a heavy range bag and leaving with a much lighter range bag!