I just finished cleaning the P-10F and P-10C pistols. What I found confirmed my suspicions regarding the P-10F.
I have been pretty good about cleaning the barrels after shooting them even if I only fired a few rounds. I have not been very good about cleaning the lock up area in the slide or the breech face. The P-10S breach face and lock up area was pretty clean since the last time I thoroughly cleaned those areas was just a 100 rounds or so ago. Not so on the P-10F. It was gummed up pretty good and required a dental pick to get the crud out of the breech face area, followed by solvent and a brush. It cleaned up quickly but I had let it go too long.
In the video above, you notice that I shot 5 rounds in the P-10F to check the holdover point and then went to the P-10S, which performed very well, especially in the vertical spread. The reason for that was that, when I shot 10 rounds through the P-10F after the sighters, I still had over a foot of vertical and I didn't think it was me. The barrel lockup wasn't very consistent is my assumption here, due to the crud in the contact areas. When I saw the vertical spread with the P-10F, I didn't just pull the S out of the bag and blast away at the range. I added some very thin Hoppe's Black oil to the little bit of crud I could see in the P-10S, hoping to soften it up so that the lock up would be consistent from shot to shot. I was more concerned over the wind picking up before I got some good results than I was with thoroughly removing what little crud was there. And it worked, the P-10S had very good vertical spread results the entire time, and I knew that when I released a shot a little high or a little low, that the hole in the paper would match.
And yes, I might have gotten some acceptable results with the P-10F, too, but, by the time I finished with the P-10S, the wind had come up, so I packed up and went home. Hindsight is always a little frustrating, sure, but I did the right thing by forging on with the P-10S and bagging the P-10F rather than troubleshooting it at the range and missing the calm conditions. The crud I saw today was pretty packed and dry, so the oil may not have helped much. That's my story and I'm sticking to it.
Joe