10# is the way it is defined, meaning a 70 shoots 60-70. However, I would venture to say that all are shooting 72-74 out of the box; so, if you can then crank it down to 60, you already have a 12-14 # adjustability. Beyond that, Mathews will probably tell you if you call them that you can shoot it backed out a certain number of turns, which is usually something like 4 turns. I've found that backing out the full number of turns usually drops you below 60 to 56-58 so there is margin on the bottom end as well. The only thing is, the margin at the top and the bottom is bow dependent so the only adjustability that is specified is the 60-70.