Badger maybe my error is in the use of the nomenclature. I am not sure about a strand versus a bundle versus a ply. I figured I had a 45 # breaking strength of a single "bundle" (the bundle being the 8 strand twine wound directly off the roll), which would require 7-8 of those bundles to meet a 6 times 65# draw weight bowstring.
What comes off a roll, is called a
strand. If you calculate you need twelve strands to make a safe string, you can take either two
bundles of six strands, and twist those into a two
ply string. Or you can take three
bundles and twist those into a string with three
plies.