I was given a Rem Mdl 121 22 RF rifle in 1949 and had a Weaver J 4 scope put on it in 1950. I used it to shoot cottentail rabbits, jack rabbits, and prairie dogs with it untill I got an Anschutz 22 RF bolt action in 1956. The 22 RF is a fine round but I never found a bargen brand ammo very accurate in my 22 RF rifles. Because of bullet drop and wind drift my 22 RF rifles are sited in at 60 yards and dont shoot past 80 yards with them. I dont recall which year I got Kimber Mdl 82 22 WMR but it was in the 1980s. I tryed out various brand of 22 WMR ammo and ended up siteing the Win 40 Gr ammo at 85 yards. It was eazy to hit prairie dogs at 125 yards but at 150 Yds the bullet dropped about 6 inches and 12 inches below the line of site at 175 Yds. So I keep my shots at p dogswithin 140 Yds with the 22 WMR. When the 17 HMR and 17 HM2 first came out I got Cooper 57 M LVT rifle for the 17 RF cartridges. The 17 HMR with 17 GR bullets is sited in at 110 Yds and the 17 HM2 with 17 Gr bullets is sited in at 90 Yds. Because the 17 RF rifles are accurate and the 17 Gr bullets have less drop than th 22 RF rifles I now dont use the 22 RF rifles for p dog shooting. A few year ago I shot a bit over 2,000 prairie dogs with the 17 RF rifles but if I wont to shoot a cottentail rabbit for eating I use the 22 RF rifles. For shots over 175 Yards at any varmint I switch to a center fire 17 Fireball or a round with more bullet energy. If I go coyote hunting in the wide open country Ill have a 204 Ruger and 220 Swift rifles in the pickup with me. The rimfire rifles are very pore yote rifles..