My 6-284 is a no turn chamber and has a 12tw Lilja barrel. I shoot 75gr Vmax using necked down Lapua 6.5-284 brass with H4350. My load is fairly moderate and shoots 3650. There's a lot of powders that'll work well for the 75gr and under bullets weights, RL26/25/22/23/16/17, 4350, 4831...