I need some help building a rifle. i have $1500 and i want to build a rifle around a Mcmillan a4 stock. i plan to be shooting out 1000 yards. originally i was going to take a remington sps tactical barrel (24" 1/10 twist) and action and put into a Mcmillan a4 stock but i dont know if there is a better option for the barrel and action. i have a mueller 4-16x50 illuminated reticle mildot scope. is there a better option for the scope?