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Tag Archive | "spine"

Differing Spine Calculator Results

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Using the SFA (Pinwheel) software, for a 29.25" arrow at 29" draw (I like my broadhead in front of my knuckles) & 63 lb draw weight, I come up with an optimal spine of 0.339 for a 125 gr head w/ 50 gr insert, and 0.327 for a 150 gr head w/ 50 gr insert.

Using the Archer’s Advantage software, with the same 29.25" arrow at 29" draw & 63 lb draw weight, I come up with an optimal spine of 0.360 – 0.391 for a 125 gr head w/ 50 gr insert, and 0.350 – 0.375 for a 150 gr head w/ 50 gr insert.

Has anyone done any research between these two programs to see if one bears out more in application than the other? Absent that, given I’m shooting a compound bow, string loop, mechanical release, carbon arrows, drop away rest, etc. would it be better to err on the side of the stiffer findings of the SFA software and stay in the 0.327-0.339 spine range to shoot either of those setups, or defer to the weaker 0.350 – 0.391 range?

Any informed input or experience that anyone can share would be appreciated, as always.


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Spine Question

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Hello everyone.

I recently changed my draw length down to 27" from 27.5" and I was wondering what the optimal arrow spine would be. I shoot my bow at 60lbs with 100 grain points.

I was shooting some old easton aftermath but am looking to try out carbon express.

Thanks


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Help with arrow spine

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Wanted to see if anyone could tell me what the correct spine and length arrow would be best, I dropped down to 60lbs at 28" but am wanting to bump up to 150-200 grain head. Right now I am shooting goldtip 7595 not sur on exact length, somewhere between 27-28"


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correct arrow (spine)

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Hello, everybody.
I’m beginner archer and I dont have any kind of assistance from a club in my area.
At the (past) many years at my area we had a coach that knew several things and he helped me a lot with my equipment.
The last years I’m alone and I’m trying to find the correct type of arrows for me and my son (13 years old).
The last weeks I have read plenty of articles, charts, etc for the correct arrows.
To be honest….. I’m more confused that informed!
Please, is there a simply explanation how can I choose the best arrow type for me???
I’m an indoor archer of 18m, (very rare to shoot field).
If my bow is 70” 36 lbs recurve and my arrow lenght (bottom of the nock slot to the end of the saft) is 27,75in how can I choose the spine for carbon or aluminium arrows??
(I have read already easton and …more charts without make any sence as I cant measure the weight of my arrows)

Is there a more simply way to choose??

Thank you….


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Correct Spine

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Want to double check to arrow spine..

http://www.carbonexpressarrows.com/s…tDrawChart.pdf

The IBO FPS on worksheet is the actual rating for the bow I assume yes? So if my bow’s IBO is 337 (the bow rating not my actual FPS at 60lbs) I would add +12 to this, is that correct?

After all said and done, my adjusted weight is 71lbs so 340 spine is the way to go I assume? I hear some say I should be using a 400 spine, but this chart says differently. I am assuming 10-15 years ago a 60lb bow would indeed use a 400 spine, but the faster bows today are using stiffer spines at 60lbs?


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Spine Index Victory

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Victory V force Xpert Arrows, are they spine indexed or indicated/ which part of label is it indicated by, if so?


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Switching from FMJ to Axis? Brass inserts? Need help choosing spine.

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I’m gonna try the axis arrows as my new hunting arrows. I’m wanting to try the hit brass inserts (either 50 r 75 grains) to make up for the wieght diff between the two arrows. I like a hard hitting arrow, just don’t like the bending of the FMJ’s. I shoot a Mathews z7 at 68lbs with a 27" 400 spine FMJ arrow and a 100grain swacker. What spine would I need in the axis when adding a 50 r 75 grain insert?


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Arrow Spine Help

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I’m looking to buy my first set of outdoor target arrows and I need help. I’ve already decided on Easton’s Carbon Ones, but I’m not sure what spine to get. I shoot an Apex 8, 27" draw length, and about 41# draw weight. Easton’s arrow chart says I should get 660s, although I wanted to check first with some more experienced archers.

Also what grain tips?

Thanks :)

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