Ok, I'm done. Really confused now...

So if a shaft supplier says he has a dozen shafts that are 50# spine, then I should really buy 60#ers because I will lose 10# in spine when I build my 28" arrow? I'll just stick with what I know from experience. A 28" arrow measured from BOP to throat of nock with a 125 grain tip is the base spine weight standard. Any deviation from that standard will affect the spine characteristic of that arrow. Guess I'm just a stubborn old coot.