I've alway's liked rimfires, I learned how to shoot with a lever action Marlin 57, so I thought I would do a little test using a Ruger .22 MKII 6 7/8", a Ruger three screw Single-Six 6 1/2" in .22 WRM, and a Taurus 5" in .17 HRM. Ranges were 50 feet, 20 yards, and 25 yards. I shot on a five inch Birchwood-Casey target. At 50 feet all were more than adequate to harvest squirrels and cottontails. At 20 yards the .22's groups opened up a little, but still were plenty accurate enough. At 25 yards the MKII was plunking them right in there, the .22WMR was "iffy". The .17HRM was grouping tight as ever. A caveat on this. The MKII and Taurus had good adjustable sights, while the single-six had fixed, rather rough sights. I had shot game with both .22's and didn't like the way .22 WRM tore up meat, so I alway's tried to stick to head shots. I had, until a week or so ago, never shot game with a .17HRM. Now one thing I'm not going to run out of is grey squirrels. My wife has 9 bird feeders in our back woods, and the squirrel love them. At one point I counted 37 in a 50 yard square area. So I decided to try out the .17 and get myself some barbecued squirrel sandwiches in the bargain. I probably didn't walk thirty yards until a big fat grey was chittering at me from an oak tree. Fourty feet, no more than that, but I made a bad shot and caught him in the left foreleg. The bullet traveled upward into his head and he dropped like a rock. The bullet impact was devastating. This round will definitely do a number on small game. I'm not going to give up my .22's, but if Ruger ever fields a reliable 10/.17HRM, I'm buying one. Ammunition used was Remington .22LR 36 Grain HP Golden Bullet, .22 WRM Winchester 40 Grain HP, and .17 HRM CCI 17 Grain HP.