Racer-X & anyone else here........
The chrony data that I posted on this thread was gathered during a shooting session with my first ever Ruger Single Six, (a blued New Model with 5 1/2" barrel & adj. sites). That gun was sold and replaced w/a 3-Screw Old model, also blued w/adj. sites & 5 1/2" barrel.
I don't remember the most accurate .22 mag load for that first gun, 'might' have been CCI Maxi Mag 40 grn FMJ. My idea is to shoot my new 'old model' and look for the 2 most accurate .22 mag loads: 1) a FMJ or JSP for bigger critters where I want penetration - ground hogs, fox, coyote etc @ 50 yards or less. 2) a hyper velocity JHP for devastating performance on smaller pests - ground squirrels, pine squirrels, etc.
One .22 LR ammo that I've found to be accurate in most any handgun or rifle is: Winchester Power Points, give them a try.
(Racer-X, how many different types of .22 lr ammo have you tried?)
When I get to the range next, I'll report back w/group sizes for the .22 mag ammo I have on hand.
Keep shooting that Single Six, you & it will get more accurate!!
Del