Two bows one arrow

[Don Case]

I'm using one arrow, spined at approx 35# and bare shaft. It has a 100 gr point. I'm drawing it 25" from two bows, both measure 40# at 25". From  bow 1 the arrow goes dead straight every time, from bow 2 it goes nock right every time. Why would that be?

Edit: Changed it again to try and make more sense, sorry

[bow101]

Oh I thought it was the other way-round it has to much spine.

[Don Case]

Thanks Bow, I changed it. I was writing faster than I could think

[PEARL DRUMS]

How wide is the arrow pass on each? That's probably your variance cause.

[Don Case]

At the nock no 2 handle is only 1/16" wider. Assuming the string bisects the handle that's only 1/32" difference. Would that do it?

[bow101]

What size are the shafts..?  I only use 11/32" that cured 60% of my problems, canting the bow helped another 10% good fletching job 10%  which leaves me with 20%  of practice and lots of it.  Untill then my grouping is still out to lunch. 

[lostarrow]

Brace height?

[Don Case]

Lostarrow  There is about 1/2" difference in brace height. The bow that shoots straight(bow 1) has the lower brace height.

Bow101  It's the same arrow for the two bows. A natural bamboo.

[beartail]

lower brace hight sounds to me.lower brace will make the bow shoot harder because the string has farther to travel so the bow with the higher brace hight isn't shooting as hard as the lower brace hight.also consider that one piece of wood is different than the other. so two hickory bows made from even the same tree with all other things the same may cast an arrow way differant

[Marc St Louis]

Try shooting both bows for distance using the same arrow.  That should tell you which bow is more efficient and consequently will push harder on the arrow

[Don Case]

I don't know of anywhere around here that I could shoot for distance and even hope to find the arrow. In the winter I could go down to the beach. Hmmm, maybe a rainy day? One bow is an OS with no set and the other is a yew with a couple of inches of set. There is no doubt in my mind which would win the distance contest. Anyway you answered my question. Just because two bows have the same draw length and weight doesn't mean that they will need the same weight spined arrows.
Thanks for all the suggestions. I think they all contribute.

[lostarrow]

Sometimes, changing the brace height even just a little bit will get your arrows to straighten out on the bow that is not shooting properly. Try playing around with that and see if it makes a difference.