I have always used bolt action rifles for prairie dogs except a reworked Ruger 10-22 Target rifle on pups. Which brand and model cal 223 semi auto rifle should I look at that will do one inch or less groups at 100 Yds. I would like to keep the rifle under 12 pounds with a scope. I do not wont one with a carrying handle. Most of my shots at prairie dogs are within 300 Yds.