guys,
when shooting woodies out of a hillstyle bow, the corresponding spine that matches the bow will usually work because:
a 28" arrow bop is actually 29" including the shaft inside the head...meaning it's 5# weaker than stated, which is good because the bows aren't cut to center and need a little more flex. This matches up to what Craig states..
If you have an arrow 29" bop, the shaft is actually 30", meaning it's 10# lighter than stated, which would mean that your shooting form likes weak arrows. This is all fine. If you are shooting heavier points than 125 gr. this weakens the shaft even more. Most guys forget about the shaft inside the head....
Rik, you are a anomaly in shooting....I mean this in a good sense. Your bows are 75# @ 28", yet you draw around 27" when you release, meaning your bow is around 71 - 72#. Remember, I've seen this....lol. You are cutting your shafts to 29" bop, meaning the shaft is 30" long for spine. Normally this would mean that your arrows 70/75 spine are actually 60/65 spine for 30"...shooting out of a 71-72# bow, with broadheads of 160 gr. weakening the arrow even more....How are you shooting 55-60# arrows out of your 72# bow? I do not know. Kelly didn't know either...however, I've seen you shoot, and the arrows fly straight....go figure. This is why archery is an individual sport and we each have to shoot what works for us....