Seal-billy: I have owned, Hunted with and used just about EVERY semi-automatic 22 rimfire that has been available in the last 50+ years.
Including those made by:
Winchester in models 1903, 74, 77, 63, 190 & 490
Remington in models 24, 241, 66, 550 & 552
Marlins of several models
Browning
Weatherby
Volquartsen
T/C
Tactical Solutions
savage
Some of these latter listed semi-auto 22's were purchased on a whim or with intent to make a profit on them but never the less I shot them and gave them a "fun factor" and accuracy test.
In my experience NONE of the above listed 22 semi-autos I have owned measure up (all around) to the fun factor, reliability, accuracy, ease of loading and value for dollars invested to the Ruger 10/22!
You want an accurate, reliable, fun 22 semi-auto then buy, use and if necessary make a couple of MINOR additions to a heavy barrel Ruger 10/22!
I have NEVER found the accuracy of one of these heavy barrel Ruger 10/22's to be lacking in ANY type of field, small game or Varmint Hunting situation!
I have very few Rifles that I would NEVER consider selling - among those few are my heavy barrel Ruger 10/22's.
The answer to your question is, NONE!
Hold into the wind
VarmintGuy