"If I had to choose, CCI mini-mag HP's. While the Stingers, Vipers and other hyper-velocity .22's do boast a significant increase in velocity, they do this in RIFLES by using slower powders. They gain nothing in handguns, and in some cases actually loose perfomance from short barrels. In my own testing, fired from barrels under 6", the mini-mags actually produced more energy than the Stingers."
MachIVshooter--Not sure what you were using to "test "the Stingers with. I chrono'd a bunch of .22's this summer and here are my figures.
Stinger-Rifle-1665 fps--4" Revo-1225fps P-22(3.5"bbl)-1175 fps
CCI Mini Mag--Rifle-1229fps--4" Revo-974 Fps--P-22(3.5"bbl)903 fps.
Federal Lightning--Rifle-1405 fps.-- Walther P-22(3.5"bbl)1045 fps.
Energy figures for the Stinger would be approx 100 ft lbs.@1175fps while the energy figures for the Mini Mag @903 fps would be in the 70 ft. lb. range. Faster out of a rifle is faster out of a pistol. In over 30 yrs of chrongraphing pistol loads I have never seen ANY load that was faster out of a longer barrel(than a second load out of that same barrel) that became slower than the second load when fired from a shorter barrel. Faster is faster all the way down to the 1 7/8" snubby's.
That said .22's are a long way down my list for a carry gun. Nick