I bought a Remington R15 (AR15) in 223 the other day. I am going to use it as one of my guns for coyote hunting. The gun has an 18 inch barrel with a 1:7 twist rate. What would you guys suggest I use for a bullet weight? Also, what would you suggest for a load for this gun. I have a friend that reloads and if I buy the brass, powder, primers and bullets he will reload for me. I was thinking about trying some berger bullets. Please let me know what you suggest.