For starters my bow came in at 28" when I ordered a 29", no big deal. But the BC shows a 64# draw (what I ordered), shooting a 300grain arrow 308fps. That comes to 20 grains BELOW IBO specs.
Is it common to be that far below IBO on a BC?
Figure 10 fps for every inch of draw. 308 at 28" is 328 at 30" IBO - sounds good to me.