I recently acquired a 14" 870P with a fixed modified choke barrel. I sent it to Vang Comp for their new FliteControl optimization package.
The first two targets were shot by me. I was in the process of sighting it in with slugs when I launched my Allen tool into the abyss; so, the gun is hitting a little high. In the 15 yard target, I snatched it left. The leftward bias is shooter error.
Both of these shots are with 00 FFC.
Here's the 25 yard shot (with KY windage):
Today I let a student shoot it in a Rangemaster shotgun class. Here are three rounds fired at 15 yards with #1 FFC: