Guys over at Rimfire Central have had good luck with them, including the 50 @ 200 guy jaia who uses a Anshutz I use them in a pair of CZ 452's with good luck. Gave a half box to a guy at the range shooting a Ruger 10/22 with Volquartsen barrel, his first five shots at 50 yards with them were a bughole.
Like most 22's no guarantee but worth 8 bucks for a box next time you are ordering. Make sure it is the Target Match Pistol Special . SK also sells a Target Match Pistol which did not shoot nearly as well
I shot at 50 - 150 rounds of 15 flavors of various 22 LR last year. THese and RWS R 100 shot about equally, humble CC Std Velocity was a close third
I did not do any chrono testing, the piece of dung Labradar would not trigger of my rimfires without a special adapter and I had finished with the rimfire tests before I went back to optical
here are the BTO measurements of them however, not that that seemed to make a lot of difference. Of course how much of that was errors in my technique not the ammo is a unknown