Yep, I've had excellent luck with the Federal 550 Bulk Packs in my two 10/22's too. For "cheap" ammo it does damn good. I've tried CCI Mini Mag's, Remington Yellow Jackets Federal Champion and none of them do any better than the Fed. 550, yet the prices are much higher.
Try some Wolf "Match", I've never tried it, but I hear it's pretty accurate.
I guess in a sense we're lucky the 10/22's are just as happy using the "economy" stuff.
__________________ Fear is a Reaction..............Courage is a Decision
Was shooting the federal bulk, cci 40 grain, and winchester wildcat?? Sighted in using federal, they seemed good, but got some low powered shots. Then finished off the cci that I had. The federal and cci went bang every time, I had one dud with the winchester, but tried again and it went off. I didn't group the cci, but I did the federal and winchester. The winchesters were hotter, and grouped better out of my Marlin m60. But the Federal were knocking down shotshells at 75-100 yards consistently.
From what I've noticed the 10/22s seem to really like the federal bulk. Whereas most every other 22 I've shot really likes cci mini mags. My m60 accuracy changes quite noticeably using different ammo while my buddies 10/22 really doesn't seem to care about ammo.