FWIW, I bought a 22 conversion for my 220. I have pretty good assortment of rimfire ammo for my 10-22's, Ruger MK II and III's and my S&W 41. Federal bulk Automatch was jam-o-matic. CCI SV works good in most of my 22's, so, lets try that. No go. Federal 210, nope. Golden Bullets, nope. Wolf no! You get the picture.
CCI MiniMags to the rescue! After several hundred of these (modest break in) and I tried CCI SV again and it works 100%! My takeaway mirrors other posts I've read, these need break in with CCI MiniMags then whatever works. Oh yeah, and as others have pointed out, lube and plenty of it.
Chris