different spine = diff nocking points?

[arrowlauncherdj]

Hey guys, I was playing around with some new arras the other day and found that a stiffer spine made me lower my nocking point considerably. Specifics are below:

1.  GT 5575 Nuge shafts. cut to 29", 100gr insert, 125 gr heads, 3 x 4" feathers with wraps had a high nocking point to bare shaft and get good BH flight = 3/8" above center shooting 3 under.

2.  GT 7595, full length (32"), 100 gr inserts, 125gr heads, same feather and wrap, nocking point 1/8" above center shooting 3 under.

difference of 1/4" and prolly could have gone maybe 1/32" more for a perfect bare shaft at 20-25yds.  Any thoughts on why this is so?

Dave

[katman]

Arrows can flex both side to side and up/down going thru paradox. My bet is the tune is not exactly the same with both shafts you mentioned or the extra arrow length is a factor.