Which Spine

[tim tarras]

I am looking at getting some black eagle arrows and need some advice on what the best spine is for me. According to the spine chart I should get a 350 spine but I want an arrow that is around 500 grains.

Would that weight weaken the spine too much and should I go to a 300 spine?

For reference I currently shoot a 28.5" CE Maxima Hunters in a 350 spine at 419 grains from Mathews Z7 at 63lbs.

Thanks you for any advice you can give me.

 

[Trial153]

I think you can probably get by putting another 50 grains up front in the insert on the 350's . You can also cut them back a bit if you had the room with your rest/ broadhead combination.

 

[Brendan]

What is your draw length?

 

[sim22mie]

Would also depend on point weight. Have you put your current setup through a chrono?

 

[Tony Trietch]

Depends on a lot of variables.

If you add weight to front of arrow it will weaken the spine, opposite if you add it to the rear of shaft.

Get yourself On Target 2 or Advantage archery computer programs. The program will not only help pinpoint exactly what yo are seeking but teach you the how and why.

 

[bcopley1116]

I shoot Spartan 250's that 518 grains. My draw length is 27.5 and I'm shooting around #82. It has been a perfect setup for me.

 

[tim tarras]

My draw length is 28". Below would be the approximate weights of the completed arrows in the different spines of the two arrows I am looking at.

[TABLE="class: grid, width: 500, align: left"]
[TR]
[TD][/TD]
[TD]Spartan 300 9 GPI
[/TD]
[TD]Spartan 350 8 GPI
[/TD]
[TD]Carnivore 300 8.5 GPI
[/TD]
[TD]Carnivore 350 7.5 GPI
[/TD]
[/TR]
[TR]
[TD]Fletches (4 at 6 grains)
[/TD]
[TD]24
[/TD]
[TD]24
[/TD]
[TD]24
[/TD]
[TD]24
[/TD]
[/TR]
[TR]
[TD]4" Wrap in front of vanes
[/TD]
[TD]4
[/TD]
[TD]4
[/TD]
[TD]4
[/TD]
[TD]4
[/TD]
[/TR]
[TR]
[TD]Nocturnals Nocks
[/TD]
[TD]20
[/TD]
[TD]20
[/TD]
[TD]20
[/TD]
[TD]20
[/TD]
[/TR]
[TR]
[TD]Arrow weight at 28.5"
[/TD]
[TD]256.5
[/TD]
[TD]228
[/TD]
[TD]242
[/TD]
[TD]214
[/TD]
[/TR]
[TR]
[TD]Broadhead
[/TD]
[TD]125
[/TD]
[TD]125
[/TD]
[TD]125
[/TD]
[TD]125
[/TD]
[/TR]
[TR]
[TD]Inserts
[/TD]
[TD]26
[/TD]
[TD]26
[/TD]
[TD]42
[/TD]
[TD]42
[/TD]
[/TR]
[TR]
[TD]added weight
[/TD]
[TD]60
[/TD]
[TD]75
[/TD]
[TD]50
[/TD]
[TD]75
[/TD]
[/TR]
[TR]
[TD]Total
[/TD]
[TD]515.5
[/TD]
[TD]502
[/TD]
[TD]507
[/TD]
[TD]504
[/TD]
[/TR]
[/TABLE]

 

[Brendan]

I would run one of the 350 spine arrows with that setup. Checking the spartan 350, if you cut the arrow down to 26.5" you're on the stiff side of "green" spine using OT2, arrow weight of 486 gr using all other specs you listed. Expect arrow speeds under 250 FPS with that setup.

Here's OT2. Like Tony said - owning a copy can be very helpful.

 

[tim tarras]

Brendan, Thank you for the info. I'm going to have to buy the program.

 

[Jtelarkin08]

I think you should def go with the 350. That z7 probably has more of a 315fps ibo at 28-28.5 inches not 330. So your gonna be plenty stiff.


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