I have taken the 168 amax out to 1200+ from a 20" 308 barrel. The 168 did better than the 175 smk and close to the 155 Palma. I was getting chrono readings of 2676 avg with an es of using 44.4 of xbr under those 168's. With that being said I do think that was a bit past it's limit. For my gun 1150 and under seems to be the most accurate with 168 amax and 155 palma's. For some reason my barrel doesn't like the 175+ weights much past 800.