tuning issues

[Stiks-n-Strings]

I,m shooting a bear super mag 48" recurve 47# at my draw of 28.5", Iswitched from a fastflight string to b50 and prefer the b50 as far as noise and feel. arrows are 2016 easton's 29.5" long 5" 3 feather 125 grain tip.
During a tuning session I shoot 3 fletched and 3 bare to get them to group. Well I got them grouping good out to 25 yds but the bare shafts impact nock high the fletched shafts impact straight. I assume my string nock is set correctly as I am getting good groups but notice that fletched and bare porpoise a bit during flight.
What could cause this and what do I do to correct it?
Thanks, Kris

[GMMAT]

Lost me...

I've never had bare shafts porpoise.

[Schafer]

Are you bare shafting them at 25 yards?

[Smallwood]

sounds like maybe your too low and they are bouncing off the shelf giving a nock high.
raise your nock height up to about 5/8" and work it down till the bare and fletched are at the same point of impact.
hope this helps.

[Stiks-n-Strings]

I am bare shafting out to 30 yards and getting good groups but bare shafts are impacting nock high, my nock is at 5/8 now. I'll play with it some more tomarrow amd see what happens. I was wondering if maybe they were bouncing off the shelf but didn't really see how they sould be with my nock at 5/8" but maybe they are. I figured it was a nock issue but wasn't quite sure.
I'll keep you guys posted, Thanks

[Smallwood]

If your using the bare shaft planing method of shooting some fletched shafts and some bare shafts and seeing where they group in relation to each other...
then just adjust to where the groups are together.
I generally don't pay attention to which way the nocks are pointing while sticking in the target, just where the points went in relative to the fletched ones.
 http://www.acsbows.com/sitebuildercontent/sitebuilderfiles/tuninglongbowsandrecurves.pdf

[Stiks-n-Strings]

I figured out my issue. My brace kept changing due to string stretch. I shot 100 to 150 shots thru it and figured it would have settled and no more stretch but I shot today before going to work and checked it every 1/2 dozen and it was changing by as much as 1/8" I finally got it settled in to were it stayed after 20 or so shots and left my bow strung and I'll check it tomarrow and see where it's at. guess I'll have to leave it strung unless I'm not going shoot for an extended period of time.
Thanks for all the advice, It sure does help to have somewhere to go for answers cause there ain't to many traditional guy's real close.

[ishoot4thrills]

Originally posted by Smallwood:
If your using the bare shaft planing method of shooting some fletched shafts and some bare shafts and seeing where they group in relation to each other...
then just adjust to where the groups are together.
I generally don't pay attention to which way the nocks are pointing while sticking in the target, just where the points went in relative to the fletched ones.
  http://www.acsbows.com/sitebuildercontent/sitebuilderfiles/tuninglongbowsandrecurves.pdf  

Hits the nail on the head. Exactly what I was thinking while I read the original post.