Use them all the time....killed a real fine deer this year with one. The arrow is 3/8" diameter, 27" long, NA style (long and low) wild turkey fletch....he dressed at 176# and that arrow went slam through from a 50" osage short bow.
I can't tell ya about heart or sap wood, cause my cedar came from a real old farmhouse that was covered with 8" cedar lap siding....talked the fella out of a pick-up full.
rich