It depends on the limbs...
Per the 2002 model year charts available on this site, the "O" cam will give 26" draw on a straight limb Phantom, and 27" draw on an Elite or recurve limb Phantom. The "OOO" cam gives 24" on the straight limb, and 25" on the Elite/recurve limb.
As stated above, the "HL" is just the high let off (75%) designation. If the cam just had the "O" or "OOO" by itself, it would be a standard 65% let off cam.
I note also that you can use the same string on both of those cams - that is unusual. For the longer draw lengths, you have to change strings when you change Fury cams.
Hope this helps.