Thanks Outpost75, will stabilisation come good if I move to pushing a 290 grain at 1300-1400fps, or is it still too light? I'd like to keep the 1:16 twist as its more useful to me for subsonics, but if there is a heavier weight I can push real fast at the same time, it would be good. Otherwise I could look around for more of an all round twist of 1:20 or 1:24 I guess to be able to perform at both ends of the spectrum.