AJ, yes it will. You will notice the spine will get stiffer until the shaft is well seasoned wheather it is a raw shaft or a finished arrow.
John, another tid bit or two about shoot shafts is the natural taper of the shaft will reduce the effective spine weight by up to 10#, so if your arrow spines out at 50# it should shoot well from a 40# bow also. And with arrow length for each inch over 28" you can subtract 5# per inch. I draw 26" but cut my sourwood shoot arrows to 29" to 30" reducing the effective spine weight from say 50# to as low as 30#. Most shoot arrows I have made will spine quite heavy so the natural taper and additional length will put the effective spine weight right where I want it.