OK, as promised....
The first group, the lower group in the center of the target came from a room temperature rifle and an ice cold shooter

It's mis-marked as H&N Sport (just switch the labels with the Meisterkugeln marked group above it). Five Meisterkugeln in a nice, round chuster.
Not bad, but not what I'm used to.
Fired a few more shots, moving down to the left, then down again with Hobby pellets.
The rifle liked them (as I remembered) but I was sighted in low and I was hitting the edge of the trap, so I moved on.
The last group (only 3 shots) was with RWS Super H Points, and clearly my rifle has a preference for them. I added a close up with a pellet alongside for reference.
View attachment 11528
View attachment 11530
Nice! Why can't they all be like this...?
This rifle has a beautiful cocking stroke and firing cycle. It is all-day easy to cock as well as smooth. The trigger tested between 1.94 and 2.18 lbs (3 pulls while shooting over the chrony) but feels lighter. Very clean and crisp. Not a 300s trigger of course, but very nice.
From speaking with the prior owner, I believe it has never been adjusted, and the rifle never tuned. It feels like a tuned gun as is. I will not be messing with it.
I took a few shots over a chronograph, just for curiosity. I figured it was a 12 lb gun but it only got close to that with Hobby pellets:
Super H Point 14.2
574. kinda snug
578. kinda snug
570. kinda snug
10.39 ft/lbs
5.53 FTT's 14.66
558. Overly snug
551. Too snug
560. Overly snug
10.06 ft/lbs
RWS Hobby 11.9
656. Good fit
658. Good fit
657. Good fit
11.40 ft/lbs
I have read that Diana wanted a rifle to compete in Field Target with the HW97, etc and that this was what they developed. I have no idea if that's true, but it is a fine rifle and I could see where it could compete, if in .177. I prefer mine in .22, as I am an enthusiast, not a competitor.
It is both humble and classy, and it feels like it was made with pride.
I think that it really shines as a "Gentlemans rifle". Definitely a top choice for Sunday shooting with friends and family, or some mellow squirrel hunting. Target shooting too, certainly.
If your plinking turns serious and and a little fun trash talking leads to rulers & measured groups (and more trash talking

), you won't need to worry about this rifle, that's for sure. It's a shooter.
Downside?
It is weightier than it looks but it isn't especially heavy. It just settles down nicely during shooting. I would carry it cradled across my middle with the barrel nearly level, "Grandpa Style", and it wouldn't bother me to spend a morning or afternoon walking the woods with it. If you feel the need to carry it with one hand on the wrist and one on the forearm, GI Joe style, you'll get fatigued IMO. I would, anyway.
The loading arrangement is very convenient and very safe. Like most things in life it is a tradeoff though, and in this case the power level is affected by the extra long transfer port. Also, there are two breech seals, of square cross section, and the one visible when you open the breech can simply pop out and become lost. Not a common item, Hector Medina was able to get me sorted out when mine arrived without one.
It has excellent field sights but scope selection is limited to short scopes only or you'll block the loading gate. Which is why mine is sporting a 3-12x44 Veyron (SFP version), which I bought specifically for this rifle.
I paid a lot of money for it, and I feel that it was money well spent. I look forward to enjoying this one for a long time to come.