Just ordered a Rock River Advanced Tachtical Hunter with 18" heavy barrel. I am probably not going to see this gun for 6 months. What 223 loads are you having the best accuracy and killing power on coyotes out to say 300 yards? I'm hunting in PA and with that terrain probably won't have the opportunity to need to shoot much further. I would like to know what brass, bullet, primer, and number grains of what powder you've had the best success with. As scarce as reloading supplies are right now, I'll probably need that 6 months to gather up what I need to load what you guys reccomend!!! Thanks for your help.