Hey guys, I'm planning my next build and would like some input from you . It's going to be a midweight (9lbs approx) carry rifle in 280 ackley, based on a rem 721 in either a Mcm a3 sporter or a Manners t5. My questions for you are would you go with a Brux barrel or a Rock barrel and how long would you go in a #5 fluted contour? Any other suggestions are welcome as well.