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Old June 10th, 2020, 07:27 AM #1
Huuman Huuman is offline
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How do you compensate for arrow spine being too stiff?

Draw length is 28 inches.

I'm shooting Carbon Express Mayhem Hunter DS in 350 spine cut down to 28 inches with 100gr field points. Got them for hunting bow set at 60lbs passed down to me.

My practice bow is set at 40lb and grouping with the arrows are all over the place.

So should I just go get 400 spines arrows for practice setup?

I understand that there could be alot of reasons why my grouping is wide (torque, forms, etc but I would like to focus on if i'm using proper arrows for this thread).

From what I read you should never go up in lbs until you are ready.

I have a few uncut 32 inches arrows left from the pack, can I try longer arrow with a 125gr fieldpoint? Would that help with grouping? I heard when it come to incorrect arrow spine, lesser of two evils is arrow being too stiff. Any advices? Thank you very much.
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Old June 10th, 2020, 08:18 AM #2
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You should get arrows for your practice setup.
But for over spined arrows you can add more weight to the tip until they fly right. My concern would be you forget what point weight you have on and shoot them with your 60# bow which could be dangerous.
Sounds like you already know the right answer.
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Old June 10th, 2020, 10:16 AM #3
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How do you compensate for arrow spine being too stiff?

In General the Spline of an Arrow is only good for a narrow range of Bow Weights at 28"...

You need to decide whether you intend to shoot at 40 pounds or 60 pounds & then choose the correct arrows for your 2 bows...

A better choice would be to just use 1 bow & buy the correct arrows for it...

A good local archery shop would be your best source of GOOD information...

Otherwise you are just wasting your time & money...

Also check out an Archery Forum =

https://www.archerytalk.com/vb/

https://www.lancasterarchery.com/?gc...IaAhoWEALw_wcB
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Old June 10th, 2020, 10:27 AM #4
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@60#28" I'm thinking you should be shooting a 400 spine, but over spine is ok. Under spine is bad.
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Old June 10th, 2020, 10:50 AM #5
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I don't know She-I-it about carbon arrows, but the law of dynamic spine for fixing wood arrows is listed below and I would think it has to be the same or similar as physics, you know. If you try reducing spice by point weights.
every inch an arrow is cut is gets 5# stiffer
ever inch longer than 28" 5# softer
Every 25 grains in point weight reduced under 125 it get 5# stiffer
Every 25 grains in point weight increased over 125 it get 5# softer

What outrider said, you want over spined in a center shot bow. It does not need to bend around the bow to clear it.
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Old June 10th, 2020, 11:39 AM #6
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Thank you for the information. I was a little confused about the important of spine in compound bow since it shouldnt need to clear the bow during flexing. I think I understand softer arrow being overpowered by the string's strength and front/back wobblying. But I dont quiet understand why too strong a spine is an issue unless you are way under poundage.

Either way I guess I should find some 400 spine, seem like they are the most versitile strength. Thank you again.
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Old June 15th, 2020, 03:53 PM #7
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Quote:
Originally Posted by Huuman View Post
Thank you for the information. I was a little confused about the important of spine in compound bow since it shouldnt need to clear the bow during flexing. I think I understand softer arrow being overpowered by the string's strength and front/back wobblying. But I dont quiet understand why too strong a spine is an issue unless you are way under poundage.



Either way I guess I should find some 400 spine, seem like they are the most versitile strength. Thank you again.
The arrow still has paradox, whatever bow it's being shot from. An arrow that is too over-spined will still have trouble recovering before hitting the target at most bowhuntibg ranges.

What kind of rest and release are you shooting?

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Old June 21st, 2020, 08:19 PM #8
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How far are you shooting that you're getting poor groups? What's a poor group for you?

I'm no expert but I read that spine matters much much more for recurves/trad bows, much less so for compounds. Therefore as outrider58 said, overspining should be okay. Have you checked arrow straightness with a spinner? Combined with some mildly bent arrows and non-bare shaft tuned shafts, that would prob contribute more to poor groups at short (<40 yards) distance for the avg archer vs. overspining by a smidge.

Hope that helps.
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Old June 21st, 2020, 08:39 PM #9
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Quote:
Originally Posted by aklax11 View Post
How far are you shooting that you're getting poor groups? What's a poor group for you?

I'm no expert but I read that spine matters much much more for recurves/trad bows, much less so for compounds. Therefore as outrider58 said, overspining should be okay. Have you checked arrow straightness with a spinner? Combined with some mildly bent arrows and non-bare shaft tuned shafts, that would prob contribute more to poor groups at short (<40 yards) distance for the avg archer vs. overspining by a smidge.

Hope that helps.
I'm no engineer, but I'd think a compound passing let-off introduces a ton of torque on an under spined arrow through the shot sequence. A severely under spined arrow can break in half before it leaves the nock.
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