300 spine is too weak, 250 spine is too stiff?

[TheCougar]

Numbers are below. Both Pinwheel and Archers Advantage show the same thing... my current setup at 300 spine is marginally weak and stepping up to 250 spine puts me all the way on the end of being too stiff. What now? Is there a thing as too stiff? I prefer to keep my arrow weight around 480ish and my speed around 290. Even if I slap in a 30gr weight up front and bump the total arrow weight to 510, I’m still on the upper end of being too stiff.

Bow: Prime Centergy Hybrid, 29” DL, 78#

Current Arrow: BEA Spartan 300, arrow length carbon to carbon 27.5” 9gpi. 125 gr head, 28gr SS insert + 30gr weight, 3 AAE Max Stealth Fletch (28gr), Nock Bushing 10gr, R nock 9gr. Total measured weight is right around 482 and speed is 291.

Proposed arrow: BEA Spartan 250, arrow length carbon to carbon 27.5” 10gpi. 125 gr head, 28gr SS insert, 3 AAE Max Stealth Fletch (28gr), Nock Bushing 10gr, R nock 9gr. Total estimated weight is right around 479 and estimated speed is 291-292.

 

[madkaw284]

Your current arrow sounds perfect. What makes you think it’s too weak?
You have to take these programs with a very large grain of salt.

 

[TheCougar]

Your current arrow sounds perfect. What makes you think it’s too weak?
You have to take these programs with a very large grain of salt.

Hitting left with BH and can’t seem to tune it out. Plus:

Current arrow

250 Spine

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[Ucsdryder]

I shot a 28” 82lb centergy hybrid last year with an axis 260. 175 up front. It was borderline weak but I could tune it. I believe arrow was 28.75”. I don’t like Broadheads near my fingers. The 250 will work great! You might need to cut it a little shorter but the tune will tell you.

 

[Billy Goat]

No drawbacks to being too stiff. If you can't correct your left with a broadhead I'd change. Add an inch to your arrow for now, you can cut it off later.


I have run 250 spine with standard inserts and 125 heads on a 345 ibo bow, 72#, and 29".

 

[Mighty Mouse]

@TheCougar are you shooting right-handed or left-handed?

 

[Jimbob]

To me correct spine is crucial. I will sacrifice other parameters to get my spine perfect. Arrow length and tip can be modified to weaken or stiffen spine.

On your .300 arrow lose a little tip weight on your .250 add some arrow length and tip weight.


I set up Axis 260 arrows for my bow and ended up with more total weight then I wanted BUT they spine perfect.
Tuned the bow with paper and bare shaft took three shots at 50 yds with three different broadheads then stepped back to 75 yds and this happened (100 grn 1.5" sevr, 100 grain magnus stinger buzzcut, and 100 grain QAD exodus). I shot the sevr last hoping it was least likely to break an arrow but it hit square in the back of my first arrow and spilt the back 4" apart)

 

[TheCougar]

@TheCougar are you shooting right-handed or left-handed?

I’m right handed, so I hold the bow with my left hand. The internets say that underspined will have BH hitting right and overspined will hit left. I’m hitting left with marginal underspined and I’m trying anything to fix it. I’ve tried all the easy fixes already.

 

[jlaner0408]

If you can, just get both arrows and start tinkering with them. Cut them long, add weight, use wraps, cut them short, take off weight, etc. I recently paper tuned my bow with element faultline 250s (28” c2c with 150 up front) and still didn’t like the way they were flying at distance once I started shooting broadheads. I decided to try some other arrows I have and shoot 4 groups of 4 arrows at 60 yards:

- first the 250 faultlines
- second was 250 black eagle rampages (28” c2c with 165 up front)
- third was 300 gold tip kinetics (27.75” with 140 up front)
- fourth was 200 gold tip kinetics (28” with 175 up front).

My bow is an Xpedition Xcentric Pro 6 with a 30” draw and 65 pounds. The 200 spine kinetics CONSISTENTLY outshot the other three, which on paper should have been better for this bow. That’s why you have to take these programs with a HUGE grain of salt. They can usually get you close, but there is still a lot of tinkering and fine tuning that has to come into play.

 

[Mighty Mouse]

I’m right handed, so I hold the bow with my left hand. The internets say that underspined will have BH hitting right and overspined will hit left. I’m hitting left with marginal underspined and I’m trying anything to fix it. I’ve tried all the easy fixes already.

Yes, that's why I asked. Everything I've read says weak spine should cause BH's to hit right for a right-handed shooter.

An easy test to see if weak spine is causing your BH issues would be to turn down your draw weight and see if BH's get closer to FP's.

 

[big44a4]

Both arrow spines would work. Had similar issue tuning and it was drop away rest tension was too loose. Something not many people think about.


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[TheCougar]

Yes, that's why I asked. Everything I've read says weak spine should cause BH's to hit right for a right-handed shooter.

An easy test to see if weak spine is causing your BH issues would be to turn down your draw weight and see if BH's get closer to FP's.

I tried dropping the draw weight and reducing point weight by 25 grains with no change. I don’t think it is a spine issue, but who knows...


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[5MilesBack]

I can get 300's, 250's, and 200's to BH tune at 60 yards at 75lbs and 33" draw. I don't think spine has as much to do with it as people think.

 

[tsm213]

I’d take a couple turns out of the limbs and see if it corrects your weak spine. Way easier than building a different arrow. If it corrects your issue then at least you know your in the right track.


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[madkaw284]

Don’t waste your money on the 250s, you can definitely tune those 300s.

 

[NYSKIER]

Have you tried shooting a bare shaft or two and correcting that way? I'm not to familiar with tuning primes but just last week I was slightly off on my bow with BH. I bareshafted close then shot field points and broadheads a couple of time long distance. Turns out all I had to do was put one half twist my yoke and I was back in the game

 

[robby denning]

I just jumped from a 400 to 300, shooting 70 pounds. The 400s actually shot fine, but these 300 seem to be shooting better. I’ve heard Randy Ulmer say almost can’t go too stiff with a compound bow.


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[TheCougar]

I had a bit of a breakthrough today... out of frustration I tried a 4 fletch and at least on the one trial arrow, it solved 80% of the issues I am having. At 50 yards I am only a couple of inches off. I’m going to fletch you a couple more 4 fletch and see if they are consistent with my BH.

 

[4ester]

I just jumped from a 400 to 300, shooting 70 pounds. The 400s actually shot fine, but these 300 seem to be shooting better. I’ve heard Randy Ulmer say almost can’t go too stiff with a compound bow.


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The man.... Tim Gillingham would agree with that. A lot of target arrows are 150 spine.


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[Planopurist]

Can you turn down a couple lbs.?


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