ORIGINAL: MeanV2
At 27.5" they shouldwork as I shot 400's out of my 71# Allegiance for a couple of years and they tuned very well.
One word of caution, single cams tend to like a little stiffer shaft than the Binarys in my experience though.
Dan
Don't blow off what Dan's saying. Bows are different. Some store more enegry at the same weight as others. Some push 70 pounds longer than others. That push crushes shafts more. The fact that all 70 pound bows don't shoot the same shaft at the same speeds is proof.