Well I didn't shoot 50 rounds, but I did find another box of CCI PM and shot some 20-round groups. I didn't have any Blazer with me, even though I thought I did when I left the house. I ended up shooting the CCI PM against my standard target ammo for the last several months, Aguila Super Extra standard velocity, in the blue and white box. I also tried some Federal Auto Match. I had some in the bag and it shoots quite well out of my Henry lever action, so I figured I might as well throw it in the mix. I shot three 20-shot groups from the bench with a rest at 25 yards. I used the 3/4" stickers as targets. They match the size of the dot in my Holosun and seemed easy to hold while shooting. Aguila is on the bottom, Auto Match in the center, and CCI PM on the top.
The CCI PM has an obviously smaller group, flier aside. As a side note, the Aguila is not terribly reliable, but the other two are quite good, with no failures during shooting. This is a composite target. There are some air pistol groups, some 357 shots, and the 22 groups.
After the bench testing, I did another round of offhand shooting, slow fire with one hand.
Same order as before. The Aguila actually had a smaller group, but just barely. The Auto Match was noticeably larger than the other two, and with the uncertainties of offhand shooting, the Aguila and CCI PM were essentially equal. Unfortunately, my pistol seems to dislike CCI SV greatly, but it will run the CCI PM without fail, at least for this session. I'll keep using the lower priced stuff to practice, since it doesn't appear to make a significant difference. Next time I go, I'll be sure to take some Blazer. I'll maybe try some Aguila Super Extra high velocity too. I can't explain the fliers except to blame my spastic trigger finger. There is one high one in each group from the bench. You could rightfully say all but the ones in the black diamond are fliers on the offhand groups. The numbers are my charge weights from 357 testing. I like this target set up. The range was quite crowded today and I was able to shoot the whole time without having to go down range after the initial placement. With this high traffic, cold range breaks are unpredictable.