Don't be afraid to delve into the world of "better" .22 RF ammo, like Lapua, Eley and RWS when and if available. CCI is ok, but it isn't what it used to be. CCI also sells what they call "competition" ammo called Green Tag, but it too has suffered as of late. CCI used to sell Match grade and Select grade ammo, but both are long gone. Eley Subsonic is not what I would call good ammo, may be good for suppressor use, but that's questionable.
Lapua makes several different types of ammunition as does Eley. Both offer pistol specific ammunition, but you have to spend some money on the different types and see if your pistol likes them. It is not unusual to find a .22 cal rifle may like a designated pistol round and vise-versa. There is no easy way around this, you have to try the various makes of ammo to see what your pistol prefers. Same with .22 cal rifles. And of course to make matters more complicated different lots of ammunition can shoot differently....UGH! Shooting .22's can be very rewarding when you find the right ammo, but very frustrating looking for it.
Don't worry about group sizes at first. .22's may seem easy to shoot until you want to get serious with them. They are not as easy to shoot accurately as some would like you to believe. Initially when looking for the preferred ammo for your pistol, use a good solid rest. Do everything by the book and do it over and over again until it becomes second nature. If you think you have a problem with something, such as your grip, change it but only change one thing at a time. If you make more than one change at a time it gets real confusing and you start chasing your tail.
.22's are super fun to shoot and are relatively inexpensive, but you have to develop a relationship with your pistol. My normal routine with any new pistol of any caliber is to run a few "paster" drills at 3 to 5 yards using 1" pasters. Two to three shots in each paster and move to the next. The goal is to get two to three hits on each paster. If you can master pasters start moving to bullseye targets at 7 yards and beyond. Don't rush Mother Nature! The accuracy will come with patience and hard, serious effort. There are few "born shooters" in my world. Most had to work hard to be good shooters and a few like me had to work real hard at it. Even a bad day at the range is better than a good day at home!
Good luck!
Rick H.