Re: What kind of groups should I be getting?
i've lately been "converted" to CZ from mostly everything else, have not looked back.
*BUT.... not to sound like a "brand name snob", most rimfires will or at least should give you under 1" at 50 10 round groups with ammo it likes, and mostly around or under 1" at 50 with ammo it doesn't like, and even bulk ammo.
before swapping a rifle out, you really should try a few different ammos ....SK, Wolf, fed. gold medal match, CCI standard vel to name a few on the Lower FPS side, CCI blazer, fed champion (blue box) on the high velocity side.
the lower subsonic (match) velocity stuff should give you the best results at multiple ranges, the HV starts to destabilize (depending on temp / humidity / altitude) at further distances when it goes transsonic (slows down around the 1080 FPS mark).
if keeping around 50 yards, remington subsonics should also be considered, and are usually more easily accessable, i think even walmart has them on the shelf.
what kind of groups are you getting that's not satisfying you?
EDIT: OoPS just noticed your using SK standard. you should be an 1" or less, again what are your groups?