For those that don't know, I purchased a Kimber Stainless Target II in 10mm a few weeks ago. My plan for this gun is to keep running it dirty until I absolutely have to clean it. I have always been skeptical of Kimbers, and only got this one because I wanted a FS 10mm 1911, and it was available. 10 days ago I took her out for the first time and ran 250 rounds of Atlanta Arms FMJ ammo and 50 rounds of Double Tap through her. Had 3 FTFs out of the same mag, the Kimber 10mm mag that came with it. Used 2 Dan Wesson 45acp mags that day and they functioned without issue. Here's the gun new and unfired. I did not clean the gun with the exception of wiping down the exterior. Fast forward to today. Took 150 rounds of 180 grain Atlanta Arms FMJ ammo and 100 rounds of PRVI 180 grain JHPs with me. Both rated at only 1000fps. Good range ammo velocity IMO. Today's results. 4 FTF's with the AA ammo. Bullet nosed into chamber and needed help getting the last bit in there by nudging the slide forward from behind. Thankfully, I had my Wilson calibration set with me (different recoil springs) and decided to switch out the stock 18.5# spring with a 20# spring. By the way, this thing was slinging spent brass all over the indoor range. My guess based on how hard it was hitting me AFTER it bounced off the partition between stations would put it around 10-15 feet if I were in the open. Changed out the spring and had no other FTFs with AA. Brass still smacking me pretty good on the rebound. Finished the AA and loaded all 6 mags (today brought 4 more 45acp mags along with me) with PRVI JHP's. Target was still out somewhere between 18-23 yards in my estimation. I had been shooting with both eyes open and decided I would try my first 5 shots of the new ammo at the same distance with both eyes open. Here's the result. POA was with the sights lined up square at 6 o'clock. Accuracy was good with the AA but improved a bit with the PRVI. No malfunctions with this ammo. Wiped her down and put her away.