Spine Chart Confusion

[AlabamaMountainMan]

I am mapping out a new arrow build for a Warf I am piecing together and the spine charts don't "feel" right to me. I am looking into the Easton Carbon Legacy 5mm Fred Eichler shafts. The bow will be 40lb @ 28" but probably closer to 41-42lb at my draw length.

I plan on using the Simmons 200g interceptor along with the standard insert that comes with the shaft (16g).
- 200g Broadhead/FP
- 16g insert
- 34" shaft
- 4 4" parabolic feathers (2.75g/feather I think)
- 15g illuminated nock
Total weight will be around 540g depending on the exact spine I select.

The confusion comes from Eastons spine chart which says to add 3lb for every 25g over 100g on the point. Since I am using a 200g point, that would mean I need to get spine for a 54lb bow. According to Easton, that means I need a 300-250 spine. Does that seem right? I don't ever see anyone posting on forums or on youtube using 250 spine arrows. Most guys are shooting 40lb-45lb recurves, shooting 600-700g arrows with most of the weight in the insert or broadhead, and still using 400 spine arrows. Additionally, Easton doesn't even make this arrow in anything lower than 340 spine. No 300 or 250. What am I missing/not understanding?

 

[archp625]

The best luck I have had with spine charts and being pretty close is the Black eagle Spine chart.

Black Eagle Arrows Spine chart | by Black Eagle Arrows

Find the perfect arrows for your bow with the Black Eagle Arrows Spine chart. Compare different arrow sizes and spines to improve your archery game.

blackeaglearrows.com

I don't shoot their arrows, but it's been pretty accurate. As always, you still need to tune your arrows to your bow.

 

[AlabamaMountainMan]

The best luck I have had with spine charts and being pretty close is the Black eagle Spine chart.

Black Eagle Arrows Spine chart | by Black Eagle Arrows

Find the perfect arrows for your bow with the Black Eagle Arrows Spine chart. Compare different arrow sizes and spines to improve your archery game.

blackeaglearrows.com

I don't shoot their arrows, but it's been pretty accurate. As always, you still need to tune your arrows to your bow.

Hmm, that also seems to imply a 300 spine. So you don't think that seems too stiff being in the 300-250 range? I am just confused why so many folks can use 400 spines with super heavy, high FOC arrows when the charts don't seem to recommend that. Unless folks are cutting the arrows shorter.

 

[archp625]

I do not. You are shooting a 34" arrow. If you were shooting a shorter arrow then yes. Does it have to be a 34' arrow or do you think you will cut it down a little to tune it to your bow? I am only asking because I would go with a 350 arrow if you plan on cutting it a little.

 

[Beendare]

IME, The limbs will make a big difference...for example cheap limbs vs high energy Uukha limbs, the Uukhas need more arrow spine.

use the free Stu Miller calculator to get you close...but only if you input data correctly

 

[AlabamaMountainMan]

I do not. You are shooting a 34" arrow. If you were shooting a shorter arrow then yes. Does it have to be a 34' arrow or do you think you will cut it down a little to tune it to your bow? I am only asking because I would go with a 350 arrow if you plan on cutting it a little.

I considered trying the 34" to shrink the gap a bit, but I am not opposed to cutting to 31" since I use a 31" now and don't dislike my gap. I don't think I would want to cut below 30".

 

[AlabamaMountainMan]

IME, The limbs will make a big difference...for example cheap limbs vs high energy Uukha limbs, the Uukhas need more arrow spine.

use the free Stu Miller calculator to get you close...but only if you input data correctly

Unfortunately idk that I would be able to provide all the data needed. I definitely would not be using Uukha limbs, but I won't be buying the amazon special either. I was considering the DAS clear burl limbs.

 

[archp625]

I considered trying the 34" to shrink the gap a bit, but I am not opposed to cutting to 31" since I use a 31" now and don't dislike my gap. I don't think I would want to cut below 30".

This may be against some popular opinions, but have to tried doing a fixed craw? Tune the arrow to your bow. So 1-2" past the riser for safety and then put a brass nock below your double nock and play with it to get exactly what you want for your point on?

 

[AlabamaMountainMan]

This may be against some popular opinions, but have to tried doing a fixed craw? Tune the arrow to your bow. So 1-2" past the riser for safety and then put a brass nock below your double nock and play with it to get exactly what you want for your point on?

Yepp, I am doing that now. It's my preferred way to shoot. It has my point on at about 25 yards and manageable gap for everything below that. I just figured longer arrow would shrink the gap even more. Not a necessity if it causes problems for me in the long run.