I went on a strenuous 4.4 mile rapid hilly hike today (man, I'm out of shape) and dropped by my local shooting spot on the way home to try to squeeze in some SU-22 trigger time before dark. I wanted to evaluate the new 4X32 TruGlo scope mentioned earlier in this thread. Short answer - I LIKE IT!
I set up the targets and on the way back to shoot I was distracted by a lot of nice brass just laying there for the taking. I couldn't resist, so 45 minutes later I had seven pounds of brass (lots of .223, 5.7 and .357 Sig)

and it was almost dark.
I shot the magazine of Federal Champion Bulk Pack ammo and went home. Here are the five targets in the order I shot them, five rounds each.
The first was shot from a sitting position, but I was winded and woozy from bending over picking up brass (told you I was out of shape), and it was nearly dark. The 9mm pistol in my back pocket is normally very comfortable and unobtrusive but is not conducive to shooting from the sitting position. I rocked back and forth sitting on the 9mm like a Weeble who wobbles but he won't fall down.

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The rest of the targets were shot from the prone position, fairly quickly, as darkness fell.

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I shot the fourth target with my middle finger pressing the trigger, per a current discussion elsewhere on KTOG, and didn't do too badly. The SU-22 felt surprisingly good that way. I should practice that more often for rifle shooting.

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For the last target, I was back to using my right index finger.

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The five successive targets had consistently smaller group sizes despite the rapidly descending darkness. At the rate I was going, I'd have been putting all bullets in the same hole after another two magazines, 15 minutes later when it was completely dark.
The 4X scope didn't seem like enough magnification to me at first. I'm old, and 40 years of intense computer use has ruined my eyesight so I like a lot of magnification, but I shot the 4X32 scope as well as I did the 9X50 scope that I used the last time. My ability to hold the SU-22 on target while releasing the trigger seems to be the limiting factor on accuracy and not the scope magnification. The 4X32 scope seems ideal on the SU-22, as others have found to be the case on many .22 rifles. Clear optics seem more important than magnification at this distance, for this type of shooting.
I thought the 32mm scope would do poorly in such a low light condition, and while the image was dim it was clear and usable, even without any way to adjust the focus. In more typical daytime lighting, I think the small and lightweight 4X32 scope will be ideal.
I didn't touch the windage or elevation adjustments after installing the new scope. I used the Leupold Zero Point Bore Sighter to locate the cross hairs from the previous already sighted scope on the bore sight's grid and adjusted the cross hairs on the new scope to the same grid offset and it seemed just about right. That's a cool feature if you swap a scope and want to be on paper in as few shots as possible.
Notice the group offset to the right on the last target. I think I had a different cheek weld and that caused a little parallax error. I remember having a hard time getting a clear sight picture in the scope. I kept getting a dark ring around the outside of the scope image, indicating my pupil was misaligned to the scope's focal point. I need to work on a good and consistent cheek weld on the Charlie stock (which I'm still digging on the SU-22).
I'm looking forward to shooting the SU-22 with the TruGlo 4X32 scope again soon. Hopefully next time, I'll shoot in the daylight instead of picking up brass.
I'm still loving this little .22 rifle. It's a ton of fun to shoot, and cheap to boot! As I mentioned before, it's settled in nicely and is now running like a Swiss watch. I think Kel-Tec has a big winner on their hands with the SU-22.
I might need to get a PLR-22 and put a bi-pod on it and have a little friendly competition with KY-Redneck-Geek and his very nice bull barrel Ruger Challenger pistol. I'd also like to find an accurate ammo that the SU-22 likes a lot and challenge some 10/22 owners after I work on my shooting skills. The SU-22 is a great little rifle to learn better shooting skills. It's my new Liberty Training Rifle.