I'll second kat's post above regarding H-1000. It and the 110 AB's have proven a big winner in my current 257 Roy. H-1000 provides great velocity, small ES's and is very stable. Consistent 1/2-3/4 inch groups. AB's hold up well at 257 Velocities, too.
Here's a 110AB I recovered from an Iranian Red Sheep. Bullet went through both shoulders and was recovered underneath the skin of the off-side shoulder. Distance was 120 yds with a starting velocity just shy of 3500(w/H-1000). Sheep dropped where he stood and never moved. Pretty amazing kill.
For grins, here's what the same load did to a Bobcat at 75 yds. Ouch!! Btw, he dropped where he stood as well.