It is osage.
Limbs may or not be used for bow wood.
Limbs may have hidden wind checks inside or stress checks from heavy snow or ice.
Limbs will make bows but potentialy they may have unseen damages not discovered until a lot of work and dry time have been expended.
I like limb bows but you got to be ready for some wasted time and wood.
Normally, decent sized limbs have about a 50/50 ratio of whitewood to heartwood but, the smaller the limbs,,, the higher ratio of whitewood there is inside.
The main trunk is the best part for good bow wood.