S&W used to use 1:10 twist in .22 LR revolvers, and still do as far as I know. I haven't tried it myself, but I get good 25 yard results with a T/C Contender with 1:14 twist - the bullet holes are just slightly out of round, which tells me they are only beginning to keyhole. As you know, a 1:16 barrel will have some of them going sideways in 10 yards, and shoot patterns rather than groups.
That has been my experience, too. I think I am going to sell my Browning BL-22 Grade ll in the box and buy or build a 1 in 9 twist Ruger 10-22 with a good aftermarket trigger etc.
Lots of urban problems that can be nicely resolved with a motly silent 60gr bullet at 950fps......
