I'd get through a full 550rd box of Federal before I even considered sending it in. It seems like most semi auto 22s need a period of break in.

If they suspect a potential magazine issue I would also wait until I bought a couple of spare mags to try with it.

Shipping a handgun is expensive because you have to overnight it. When I looked into doing it with another gun it was going to cost about $70. I ended up working out the problem on my own.