All,

I need a little help.  I am trying to tune a Check mate hunter and am having fits.  53# at 29 and I am drawing 29.5

I have some Doug Fir shafts 23/64 spined 80-85 cut to 30.5" with 160 grain points.  Bare shafting I am good up and down, but when I hold the bow vertically and shoot, the nock end of the bareshaft goes to the left???  I am a right handed shooter.

Fletched arrows shoot good so maybe I am just splitting hairs

C

weak - take off point weight

Don't worry about moderate lean too much; if the shafts and arrows are flying the same that's what counts.

Bjorn's right on. How do your bare shafts and fletched group. Together and you've got it!

Listen to Bjorn.  Bare shaft to fletched shaft tune.   Once that is right you have excellent flight.

If bare shafts and fletched hit the same spot you are good.  If the arrow is moving left then take off point weight.  Have shot broadheads on fletched shafts with field points.  If they group yo are good.  If they go left take off point weight of shorten arrow.

thanks guys.  

i looked again and I guess I have already bumped the points down to 125gr.  Does anybody else think that I should be way overspined at this point but am showing underspined.  I am not sure that i matter but I sure thought 80-85's would enable me to use 160 gr points

C

That is a long shaft at 30.5 and will account for over 10# of spine by itself. Fletching will make the shafts act quite a bit stiffer.
I don't think you are overspined at all- by my calcs you are weak with 160 gn points and I assume you are using a FF type string.

thanks Bjorn,

That is definetly what I am seeing.  So I guess i will stick with the 125grain.  What do you think it would do if I put an internal footing in the shafts using the jig that 3 rivers sells.  A piece of nail to be exact.  I would like to get my FOC up and still use wooden shafts but it is pretty hard to find shafts reliably over 90 lbs spine?

C

Surewood goes up to 115lb spine, start over if you don't like the lighter point weight. You can only add more weight to the back to fix it, if it's still weak. The footing will make it worse. 23/64th will have the highest spine rating

I agree see if your bareshafts group with your fletched shafts. If they than you are perfect.