Joncaddy,
My '46M is usually fed RWS R10 Pistol (7.0 gr.) and/or JSB Match (Green, 7.33 gr.), and it shoots both of these equally accurately.
WRT 'field' pellets, the Izzy also shoots JSB RS, Express & Exact really well too
I really like my Izzy
From the shooting I have done from the bench at 10 to 20 meters, the Izzy has matched the grouping of my FWB65 & Diana Mod 10 vintage springers.
Just make sure you keep the seals well lubricated - I use motorcycle fork oil (Fuchs/Silkolene SAE 30).
Have fun & a good weekend
Best regards
Russ