The only S.S's I've tried are the Remingtons and the 60 gr Aguilas. The Remingtons will drop a grey squirrel in his tracks with a shoulder shot @ 65+yds(still got him in the freezer) and they shoot very accurately out of my Remington 581 bolt gun. I only tried the Aguilas on paper(sort of)@ 25 yds. It seems like they might have the punch for squirrels(but probably like the Remingtons, with a distinct rainbow trajectory past 25-30 yds)but even at 25 yds, my gun won't group them any closer than 1-1.5 feet...yes I said feet. In my gun, the Remingtons and CCI Stingers always shoot the same POI except for elevation(naturally), grouping around an inch or a little more. The first shot with the aguilas was way right. I tried another and it was just as far left. The next few randomly went high-low-left-right...after 10 rounds of the Aguilas, I stopped trying, because it was pointless.
I'd guess the problem is likely that the long bullet just won't stabilize with the twist rate that most .22 lr's have. If you had a .22 with a faster twist(1-9 or 1-10 maybe?)you might have something for squirrels. Even if they shot beautifully, it's not even remotely a coyote round, unless he's on your back porch, and even then I wouldn't want to count on it. If you MUST use a .22lr for coyotes, I'd suggest something like the CCI Stinger,Quik-Shok, or Velocitor...now those things have some smack @ 50 yds. They dent the heck out of my spinner target /ubbthreads/images/graemlins/grin.gif.
Judging by some of the replies, I think a few people might be confusing the 60 gr."Sniper Sub-Sonics" with the "Super Colibris" which have a 20 gr lead bullet and no powder, just the primer charge. The 60 gr round would stop a charging hamster no problem...if you could hit it.