So to answer Nutty's question, if the limbs are the right ones and the rigging (string/cable) are twisted properly to specs most bows will peak a couple pounds over the bows rated peak weight. There is some variance in the industry with plus or minus a couple pounds being acceptable. So a bow rated for 45-60 may end up anywhere from about 58# to 62#. Two pounds either way isn't going to hurt a darn thing. It can be changed simply by changing string and/or cable length a hair.
It's similar to automobiles. EPA rating might be 35 mpg. One might get 38mpg and one gets 33mpg. Both are within acceptable limits.