Spine stiffness?

[albertadeer]

I just got a good deal on a dozen Gold Tip arrows, normally I've been shooting 300s now these are 340s.

Bow is a Limbsaver, 28.5" draw, 65lbs draw weight, with 100gr tips.


Am I safe with 340s? Seems like it should be.

[L.O.S.T.Arrow]

Better spine for your set up with the .340s than the .300s stiff side [and heavy]

Neil

[albertadeer]

Originally Posted by L.O.S.T.Arrow

Better spine for your set up with the .340s than the .300s stiff side [and heavy]

Neil

So .340's are a better match?


Thanks a bunch. I'm glad I bought them.

[L.O.S.T.Arrow]

yup . the .300s for a 28.5@65lb are at the extreme over stiff...wasnt too long ago the majority were shooting the .400's at those bow specs...I always maintained the .400's were too light and the .340's were spot on...

In fact the .340s are on the borderline heavy side for a 28.5@65lb

perfect for hunting...

Neil

[FallAirFever]

Originally Posted by L.O.S.T.Arrow

yup . the .300s for a 28.5@65lb are at the extreme over stiff...wasnt too long ago the majority were shooting the .400's at those bow specs...I always maintained the .400's were too light and the .340's were spot on...

In fact the .340s are on the borderline heavy side for a 28.5@65lb

perfect for hunting...

Neil

That's good to hear Neil. My M7 is set at 28.5" pulling 64lbs. Shooting the same arrow, not sure off the top of my head how long my arrows are, I think 28". I hate this time of year... I am shooting fine bow seems to be working fine and all I can think about is wondering if every little detail of my set up is okay or not!

[Mike_W]

What length are your 300s I would be interested buying or trading for pro hunter 340s.

[Mike_W]

Originally Posted by L.O.S.T.Arrow

yup . the .300s for a 28.5@65lb are at the extreme over stiff...wasnt too long ago the majority were shooting the .400's at those bow specs...I always maintained the .400's were too light and the .340's were spot on...

In fact the .340s are on the borderline heavy side for a 28.5@65lb

perfect for hunting...

Neil

Sorry Neil not to disagree with you here but as per Gold Tips arrow selection chart and assuming the OP's arrow is the same length as his draw he is right on the line between 340's and 300's with a 28.5 inch arrow using a 100 grain BH or FP.

Gold Tip also suggests when on the boarder line to opt for the stiffer shaft as you are better overspined than underspined.

[SamSteele]

I was shooting 340 spined Eastons and ended up loosing a few shooting gophers. The shop didn't have the same ones so they sold me STL Hunter 300s. The 340's group nicely and the 300's are all over the place. If I could trade the 300's for more 340's I would.

Setup is a Martin Saber, 65# weight, 125 grain heads, arrow shafts are 29.5", Blazer vanes.


SS

[L.O.S.T.Arrow]

Originally Posted by Mike_W

Sorry Neil not to disagree with you here but as per Gold Tips arrow selection chart and assuming the OP's arrow is the same length as his draw he is right on the line between 340's and 300's with a 28.5 inch arrow using a 100 grain BH or FP.

Gold Tip also suggests when on the boarder line to opt for the stiffer shaft as you are better overspined than underspined.

He is at 65 LB

[Mike_W]

Originally Posted by L.O.S.T.Arrow

He is at 65 LB

And?????
https://www.goldtip.com/arrowcontent.aspx?page=chart

[MathewsArcher]

Without knowing how long the actual arrows are how are you determining if they are the correct spine? Are you assuming they are 28.5 inches? Most shoot an arrow significantly shorter (1"+) than their draw length.

[brohymn2]

Originally Posted by MathewsArcher

Without knowing how long the actual arrows are how are you determining if they are the correct spine? Are you assuming they are 28.5 inches? Most shoot an arrow significantly shorter (1"+) than their draw length.

depending on what a person was looking for in an arrow, you could be shooting 300's at those specs but longer, with a heavier point. that said neil is pretty bang on assuming the arrow length is 28.5", I have the same specs except DW is 70 lbs and I shoot 300's which are flying pretty awesome

[kujoseto]

I'm running 28.5" long .340 with 125gr tips at 72lbs without any problems. Not sure where that would fit on the goldtip chart but I'm pretty sure I was on the line with the easton chart iirc. (Too lazy to check gt chart) Seems more accurate than I can be. If there were serious concerns about breaking arrows I think someone would've stopped me by now (or it would've broken)

[brohymn2]

Originally Posted by kujoseto

I'm running 28.5" long .340 with 125gr tips at 72lbs without any problems. Not sure where that would fit on the goldtip chart but I'm pretty sure I was on the line with the easton chart iirc. (Too lazy to check gt chart) Seems more accurate than I can be. If there were serious concerns about breaking arrows I think someone would've stopped me by now (or it would've broken)

what bow are you shooting? when I tried 125gr points with my setup(mamba air) and paper tuned the tears showed up as super weak.

[kujoseto]

Bowtech experience
I also bothered to check the spine charts just now too. Out of curiosity.
Goldtip suggests I'm considerably underspined with their 340 arrow, and easton suggests at 28" I'm on the correct spine and at 29" I should go 300. I'm shooting easton 340s so it's probably good. Again, the accuracy seems to be there so if I'm that close on the chart I think the safety is fine too
Edit: I think this is my 4th edit on this post lol, but funny sig by the way

[brohymn2]

Originally Posted by kujoseto

Bowtech experience
I also bothered to check the spine charts just now too. Out of curiosity.
Goldtip suggests I'm considerably underspined with their 340 arrow, and easton suggests at 28" I'm on the correct spine and at 29" I should go 300. I'm shooting easton 340s so it's probably good. Again, the accuracy seems to be there so if I'm that close on the chart I think the safety is fine too
Edit: I think this is my 4th edit on this post lol, but funny sig by the way

That'd awesome you were able to make it work.

[Alberta Bigbore]

In my Bowtech Experience........I'm running 300 spine GT at 72 lb with 28.5 inch draw.... 28 3/8 " arrow 100gr tips.

[Alberta Bigbore]

Originally Posted by L.O.S.T.Arrow

yup . the .300s for a 28.5@65lb are at the extreme over stiff...wasnt too long ago the majority were shooting the .400's at those bow specs...I always maintained the .400's were too light and the .340's were spot on...

In fact the .340s are on the borderline heavy side for a 28.5@65lb

perfect for hunting...

Neil

I have to disagree. I think 340 would be bang on for 65 pounds and 28.5 inches. When I ran that Prime I got rid of.... getting arrow flight was horrible at 72 lbs... with 340. And had to drop weight in the front and add weight to the back of the arrow.

Went to a 300 on a whim.... never looked back. So dropping down to 340 or a 330 better yet I think he would be ok at 65lb. But defiantly. . Not on the heavy side at 65.

Then again...that's what worked for me lol

[L.O.S.T.Arrow]

Originally Posted by Mike_W

And?????
https://www.goldtip.com/arrowcontent.aspx?page=chart

Look at the chart...he is 28.5@ 65 using a 100Gr...
assuming the bow in actuality is below the 315 FPS chart ...which most bows are at the draw and bow weight...its states plenty heavy and not a .300 until 30 inch draw ...thats a huge differance

If by some Miricle his bow is above that 315 FPS at 28.5@65lbs....than it also reads correct up to a 29" draw...

And to add...If Bow drops to just to 64 due to string settling...its way heavy enough to a 30" again even above the 315 FPS...
and if below 315 it actually reads too heavy with a .340 and suggests a .400

So the .340 should be plently of spine and weight

Black and white

Neil

[albertadeer]

I can shoot the hair off a ticks azzhole at 40yds...


They fly much better!



Ready for bow season!! Pew! Pew! Pew!!!

[Mike_W]

Originally Posted by L.O.S.T.Arrow

Look at the chart...he is 28.5@ 65 using a 100Gr...
assuming the bow in actuality is below the 315 FPS chart ...which most bows are at the draw and bow weight...its states plenty heavy and not a .300 until 30 inch draw ...thats a huge differance

If by some Miricle his bow is above that 315 FPS at 28.5@65lbs....than it also reads correct up to a 29" draw...

And to add...If Bow drops to just to 64 due to string settling...its way heavy enough to a 30" again even above the 315 FPS...
and if below 315 it actually reads too heavy with a .340 and suggests a .400

So the .340 should be plently of spine and weight

Black and white

Neil

The chart is based off IBO as they use it to determine the aggressiveness of the cam. I am assuming the OP bow is over 315 IBO as Limbsaver never had a bow under that.

So again he is right on the line ....not waaaayyy over and as mentioned its better to be a little over than a little under.

It really comes down to will it broadhead tune. If it does with either arrow it really doesn't matter what a chart says.

[L.O.S.T.Arrow]

Originally Posted by Mike_W

The chart is based off IBO as they use it to determine the aggressiveness of the cam. I am assuming the OP bow is over 315 IBO as Limbsaver never had a bow under that.

So again he is right on the line ....not waaaayyy over and as mentioned its better to be a little over than a little under.

It really comes down to will it broadhead tune. If it does with either arrow it really doesn't matter what a chart says.

Agreed ...I strongly suggest a heavier spine than a weak one or even border line...

However yes the chart is IBO but actual IBO.... NOT IBO RATED top speed

Most Bows RATED 330 FPS at 28.5 @ 65LB ...will be under 300 FPS

*How fast is your bow…Take rated IBO…
IBO speeds are based on a bow with a 30" draw set at 70lbs shooting a 350gr arrow.
-For every inch of draw length you go down you will lose 10 FPS
-For every 5# draw weight you go down you will lose 10 FPS
-For every 3 grains of weight your arrow is over IBO ( 5 grains per pound) you will lose 1 FPS
-For every 3 grains of weight you add to your string you will lose 1 FPS


Dont take much to bring the ACTUAL IBO down to 300 or less 28.5@65Lbs

Neil

[kujoseto]

Originally Posted by albertadeer

I can shoot the hair off a ticks azzhole at 40yds...
They fly much better!
Ready for bow season!! Pew! Pew! Pew!!!

Hahahaha

[Mike_W]

Here is a great video I suggest everyone watches it as it points out some good arrow theory and selection.
https://www.youtube.com/watch?v=FfvB...lYO778R-9EPBK-

As you can see Neil at the 1:15 mark there is no reference to "actual IBO" but IBO rated.

Cheers,
Mike

Originally Posted by L.O.S.T.Arrow

Agreed ...I strongly suggest a heavier spine than a weak one or even border line...

However yes the chart is IBO but actual IBO.... NOT IBO RATED top speed

Most Bows RATED 330 FPS at 28.5 @ 65LB ...will be under 300 FPS

*How fast is your bow…Take rated IBO…
IBO speeds are based on a bow with a 30" draw set at 70lbs shooting a 350gr arrow.
-For every inch of draw length you go down you will lose 10 FPS
-For every 5# draw weight you go down you will lose 10 FPS
-For every 3 grains of weight your arrow is over IBO ( 5 grains per pound) you will lose 1 FPS
-For every 3 grains of weight you add to your string you will lose 1 FPS


Dont take much to bring the ACTUAL IBO down to 300 or less 28.5@65Lbs

Neil

[L.O.S.T.Arrow]

Originally Posted by Mike_W

Here is a great video I suggest everyone watches it as it points out some good arrow theory and selection.
https://www.youtube.com/watch?v=FfvB...lYO778R-9EPBK-

As you can see Neil at the 1:15 mark there is no reference to "actual IBO" but IBO rated.
Cheers,
Mike

Mike think about it...

An APA Mamba King Cobra at IBO and actual at IBO is shooting 370 plus...

So you are saying if we got that King Cobra at 50 lbs and the shooter is 27 inch draw...that doesnt matter and he should shoot rated IBO...ha ha ha.....

27@50 he will be shooting a .500 not a 300 or stiffer just because of IBO rating not actual...

Neil

[L.O.S.T.Arrow]

Originally Posted by albertadeer

I can shoot the hair off a ticks azzhole at 40yds...


They fly much better!



Ready for bow season!! Pew! Pew! Pew!!!

Awesome...good job

Neil

[Mike_W]

Originally Posted by L.O.S.T.Arrow

Mike think about it...

An APA Mamba King Cobra at IBO and actual at IBO is shooting 370 plus...

So you are saying if we got that King Cobra at 50 lbs and the shooter is 27 inch draw...that doesnt matter and he should shoot rated IBO...ha ha ha.....

27@50 he will be shooting a .500 not a 300 or stiffer just because of IBO rating not actual...

Neil

Neil stop trying to construe what I am saying to try and make yourself right.
They have two charts one is for IBO rated bows under 315 fps and one is for IBO rated bows over 315 fps each has their own spine chart based off of draw weight and arrow length.
The reason for the two charts is high IBO rated bows usually have a more aggressive draw curve and cam. This has sweet FA to do with draw weight or length......Think about that!

And FYI the above example of yours needs a .400 spine

[backyard]

Originally Posted by L.O.S.T.Arrow

Mike think about it...

An APA Mamba King Cobra at IBO and actual at IBO is shooting 370 plus...

So you are saying if we got that King Cobra at 50 lbs and the shooter is 27 inch draw...that doesnt matter and he should shoot rated IBO...ha ha ha.....

27@50 he will be shooting a .500 not a 300 or stiffer just because of IBO rating not actual...

Neil

you want a really stiff arrow and what the hell do you know ...lmao j/k

[kujoseto]

It does appear that the different brands are suggesting different spines in many cases so it's probably best to go according to the arrow brand you're using. As for the ibo, I'm thinking it's maybe a bit of a combo of both arguments. My GUESS would be it's like the way elite bows advertise their ibo. They reduce the speed according to draw length.


Edit: to refer to Neil's deduction suggestions, it would make sense TO ME if it was used up to the point of the increased arrow weights, making the assumption ibo is not changing the arrow weight thus only reducing ibo based on dl and dw.

[L.O.S.T.Arrow]

Originally Posted by rpm360

you want a really stiff arrow and what the hell do you know ...lmao j/k

Bazinga!!!!