Agree for walking around varminting. My favorite rifle for that is a Rem 600 in 222. Beat to hell, but still accurate, light, easy to carry. Great little rifle. - danI don't see a need for heavy barrels for coyote rifles. You aren't going to be doing high-volume rapid-fire shooting; a heavy barrel makes sense for prairie dogs or ground squirrels, where you are going through hundreds of rounds in a short period and are likely not moving around much. I sure don't want to carry around a heavy-barrel gun going from one calling spot to the next to the next.
Kind of the same for barrel life; you could burn out a barrel pretty fast on small varmints in quantity, but a great coyote hunting day is still likely less than 10 shots fired. Your barrel will outlive you.