I am about to start building a 223 trainer rifle. I am trying to figure out what bullet to shoot out of it so I can get the right twist barrel. This will be for long range target practice off barricades and probably will shoot it in some of the smaller PRS matches. That being said, I also want to shoot prairie dogs with it and kill them quickly. In your opinion what is a good double duty bullet? I have been looking at the 69gr SMK but there seems to be mixed reviews on using them on varmints. Does anyone have any experience with the different 223 match bullets on prairie dogs? What would you recommend?