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Just remember that most rimfires like to "season" themselves before they shoot their best. Don't change ammo types after you clean it. Pick one kind and shoot 20 or 30 rounds before you shoot groups.
I've seen guns that would double or triple the group size when changing ammo - until they had a half-box of the new stuff down the tube, and then they magically tighten up again.
I believe it has to do with the interaction of those dead-soft bullets with the previously deposited lube and powder residue. Until the gun scrubs the old stuff out and lays down a uniform layer of the new lube/powder, those bullets just don't react well.
For best results, stick with one type of ammo in rimfires.
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