I've got a .308 bull bbl and I'm giving some thought to making a sporter weight octagon. I know NOTHING. Nothing in my gunsmith books. Side milling, end milling? Numerous light cuts? Fewer medium cuts? Temperature control? How many holdown points for 22" finished length. Any tips for avoiding stress warpage? And so on, because actually I don't even know enough to ask the right questions. One thing I can say with confidence, time means nothing on this project. I would like to end up with a round section of 3/8" or so abutting the receiver...just for looks.