My next rifle is going to be a 243 for increased long-range practice (vs my 300WM) and coyotes. I had decided on the 243 Win, but then I realized I'm going to have to put a gun together if I want a fast enough twist for the heavier high-BC bullets (I didn't need much excuse to go for a higher-quality-than-factory barrel anyways). Now that I am going to that much work, someone suggested the 243 AI indicating it would actually have longer brass life (less stretching) and equal or longer barrel life despite higher velocities. I'm also told the brass is available commercially so I don't have to fire-form. While most shooting will be within 400 yds coyote shots could be out to 800 and targets as far as the gun can reach on occasion. Anybody have opinions on this? Am I overlooking another round I should consider? Recoil must be 308-level or under....I can shoot the 300WM if I want to deal with recoil to get those ballistics.