I have decided on a 300 blackout for my ar. I am going for a 16 inch barrel. What I do not know is what twist rate to go for. Any help on twist rate? I assume the question I am going to get back is along the lines of: "What grain bullet are you shooting? What velocity?" To which I will say I don't know this is my first 300 blackout. If someone know of a good article on this let me know, or just has a good opinion that would be great. Thanks all.