I have shot Atlanta Arms 115 JHP for years in my 9mm CZ pistols at 100 and 200 yards with excellent results. A few years ago the AA ammo was too hard to get, so I looked for an alternative and found the IMI 115 gr JHP ammo the best of the ones I tested. I have alternated between the two rounds depending on which one I had in stock. I've had sub 4" five shot groups at 100 yards with both.
Today I decided to shoot 30 rounds of each 10 rounds at a time, on each of 3 targets, with the video camera running so that I could sort the holes by sequence and brand. I expected to have several "good" five shot groups from each, but I also expected the POI to be a little different, on the order of magnitude of 3-4" high or low, left or right. When I'm shooting well, those expectations are realistic.
Today, however, I wasn't shooting well. I shot the P-10F on Tuesday, and I'm heading out of town next week, so I rushed to the range this morning to get in one more session this week before leaving town. I had a lower back flare up on Tuesday after that session, rested on Wednesday, and thought I would be OK today. The back was good, the eyesight and steadiness, not so much. I forged on, got in my 60 rounds, tried to analyze the video, and finally concluded that the two ammo choices were pretty much identical on a "bad" shooter day--meaning the differences in the ammo were less than the variations in the shooter's skill, making a comparison less than optimum. In other words, the shotgun groups from each ammo seemed to overlap each other, with maybe the IMI a little lower and a little left of the center of the AA group but both groups were too large to say anything about accuracy differences. I won't pick one over the other in the 4.5" pistols.
It's only the 3.5" P-10S that I remember seeing any larger differences, and I may duplicate this test with the P-10S next.
Here is a video of all 60 shots, dead time edited out, with the marked up backer sheet at the end with all 60 holes color coded. Comments welcome. I missed focus on the shooter camera, sorry about that. Live and learn.
https://youtu.be/zSy_6VEB3FAThis is fun. This is not easy. And it's hot and humid here now.
Joe L