Apparantly its different for everyone, but those Carbon Rebel 45/60 @ 29" with 125 gr points are way too light (or underspined) for my 60# Ben Pearson. Theyshoot way off to the right (I'm lefty), and leave a nasty jagged tear on the paper test. The Carbon Rebel 60/75@31" with 125 point, however, leaves a perfect outline of the fletching! Overall, it just feels and shoots straighter, much better.