I am in the market to buy an Alexander Arms Over watch 6.5 Grendel. I will upgrade to the Monolithic upper, and Shilen barrel (I think). My question is what barrel length should I do. I will use it hunting deer and coyotes. Where I hunt is a power-line on a large farm. My longest shot is 600 yards, followed up by multiple lanes that range from 300 yards to 425 yards. It is not uncommon to see coyotes paired up while I am deer hunting. I have chose the Grendel for its semi auto quick follow up shot so I can shoot both coyotes, not just the one. Any how, my question is should I go with the Shilen barrel? Should I get the 24 inch barrel or the 19.5 inch barrel. I assumed 24 inch barrel, but I have had three long range shooters I know in my area say the Grendel was designed to fully burn all the powder in a 19.5 inch barrel, so a 24 inch barrel could create drag and not really benefit me in accuracy. I am hunting out of a really nice box blind that I ride my ATV within 20 yards of and park. So weight is not a factor. Looking for accuracy. If the 24 doesn't really help at all, then the 19.5 would be handy for portability moving around in the blind. But accuracy is my first concern. Sorry for being long winded, thanks for the help in advance.