Spine

[boneaddict]

125 grain and yes, both practice and broadheads are 125.   

Does a heavier arrow have much effect of settling them down.  I was thinking about adding inserts or some weight.

[NWWABOWHNTR]

google stu miller's spine calculator... its free and will get you in the ballpark..   The more weight at the tip the weaker the spine will become. 

[NWWABOWHNTR]

http://bowmaker.net/tuning.htm   This is by OL Adcock,  all about tuning. 

[STIKNSTRINGBOW]

A heavier Broadhead will reduce spine,
a heavier arrow might settle it down, I know they reduce hand-shock and quiet the bow some by absorbing more vibration.....

[boneaddict]

It is 70 pounds at 32.   Which makes more sense because I thought it was lighter than my old longbow.  I shot them both last night and the 7595s shot better, which makes no sense to me as the 5575s shoot better out of my old bow which is heavier draw weight.  My knock looks as if its a tad high.  I was thinking about going about one knock length lower.  I'm waiting for a day with no wind whatsoever to come to my final conclusion.  Its been blowing pretty hard in the Wenas the last couple nights.  I have one arrow I am throwing out as its obviously an outflier.

[boneaddict]

If I did that spine calculator right, it confirms my initial thought I am right between the two of them.  One is spined not enough and one is spined too much.

[Big10gauge]

Might want to try lowering your nock and maybe twist your string to increase your brace height if you think you're running a weak spine.

[Hornseeker]

Lots of good info here Doug, but lets just start at square one...

Yes, you are about 70@32.

This bows riser is cut deeper than your old one, so a weaker arrow flies better out of your older one, even though its a bit heavier bow. If you were to use thicker material on the side plate of this bow, it would also take a weaker arrow, but I'd recommend staying with the 75/95's..

You shooting split finger? The first thing you want to do is get your nock point set. So, take 2-3 of those 75/95's with NO feathers on them, and 2-3 with feathers, stand at about 15-20 yards, and shoot them all at the same spot... are the bare shafts hitting low or high?? Lets back up one step... do you have a bow square? If so, put your nock point a good 5/8 to 3/4 inch above square. I'm not sure why, but my bows have always preferred a higher nock point. If your arrow is hitting much lower than your feathered arrows, then lower your nock point about 1/16 inch and so on, untill they come together...all shafts, bare or feathered, impacting about the same height....

Then... are your bares hitting left or right of your feathered groups? Those 75/95's are likely a bit stif, so they "SHOULD" hit left (the bare shafts should be left of the feathered shafts)...BUT....if they are way too stiff...you can get a false reading and they may show right, but you should hear a pretty good thump on the riser......

[Hornseeker]

So what you do now... if they are stiff...which they may be... you can use a heavier head, like go to a 145 field point... OR.... go back to the 55/75 and stay with the 125. If you do that, you can just put another layer of leather or velcro or whatever on the side plate to bring the 5575's into tune...

Confused yet??

1st things 1st... go shoot the bare shaft groups with the feathered groups...do it with both sets of arrows and tell me what you see....

[boneaddict]

WILL DO.   THANKS!

[boneaddict]

I'm looking to shoot a little heavier, so might try that route if need be.  I'm about 2/3" above square on nock.  I am at work but eyeballed it last night.   I think I raised the old bow a bit, so thats about where it is.  I do what you said.  yes, I am shooting split finger

[Hornseeker]

Oh yeah, and like someone mentioned....make sure that you have at least 6 1/2 inches from the deep part of hte grip to the string (brace height)... you can even go 7 no prob, but I dont go any more than that... some guys do....

[NWWABOWHNTR]

SOme great advice there from Ernie... I started with the Sapphire out at 7 1/4 brace height but am now at 6 3/4 and it shoots sweet there.  Mine is 54@28 so at 30 I am guessing it is 62#'s,  and am shooting 500 spine cut to 30" with 125 gr points.   

[Hornseeker]

Dang...and you've bare shafted that 500? That seems weak, but you sound like you know what you are doing! Good deal.

[NWWABOWHNTR]

I have bareshafted it and they flew great.  WHen I first got my ACS I thought I'd need 400's so I bought a dozen shafts and they tuned ok... then for fun tried the 500's cut them down to 30 and they flew great.  So I didn't even try the 400's with the Sapphire.  I am not going to complain about the way they shoot,  did have a problem at first with a little porpoising,  but adjusted the nock height to 3/8's high and that is now good.  Now you have me thinking and I am going to try out some 400's on the Hawk... just to put my mind to ease.