The .17's are accurate enough but with their slower- than- with -rifle velocities they often fail to expand their bullets at long ranges. Nuff said about them. The .223 in a Super 14 is a great coyote caliber. I get 3000 FPS using Speer 50 gr. TNT's, Speer 52 gr. HP's, or Hornady 50 gr. SX's. They all work well on critters from prairie dogs through coyotes as far as I'm capable of shooting, which is just shy of 300 yds. Both H335 and 2230 powders work well for me but the 2230 is a little quieter and gives less muzzle flash. Use mag primers 'cuz they'll light powder even in cold weather.