Guys, I'm dipping my toe into handloading and precision shooting for the first time and could use some advice for my first set of component purchases. This is for an AR-15 with this 18" 1:8 twist 410 stainless barrel from BCM. Bullets Given the 1:8 twist rate, would I be better served by going 68/69 grain or 75/77 grain? Hornady Match 68gr - BC: .355 Nosler Custom Competition 69gr - BC: .305 Sierra Matchking69gr - .305 Hornady Match75gr - BC: .395 Nosler Custom Competition 77gr - BC: .340 Sierra Matchking77gr - BC: .362 Powders I'm totally in the dark here. Totally. Supposedly I should go with a slower burning powder for the "heavier" bullets....? I've seen plenty of powders listed, but the frequent ones are: H-4895 Reloader 15 (Reloader runs really dirty?) Varget (plenty of people love it, plenty hate it?) IMR 4064 (grains are too big to easily load into the .223 case?) Really clueless on this. Appreciate your thoughts!