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Author Topic: Arrow Spine  (Read 409 times)

Offline AlbinoRhino

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Arrow Spine
« on: February 16, 2017, 11:02:12 AM »
I get to buy a new set of arrows for this season and had a spine question for the experts.. I shoot a Mathews No Cam Htr with a drive away rest.. #70 at 29 inch draw last season I shot 30 inch arrows with 125 grain tips and next season plan on doing the same plus possibly adding a 50 grain insert... some harts have me at different spines but last year I ran a .250... anyone have any information regarding if I should be a .250 or .300+ or does it even matter.. I have found inconsistent info online

Offline Mtnwalker

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Re: Arrow Spine
« Reply #1 on: February 16, 2017, 11:15:54 AM »
Is that 250 with a carbon express arrow?

Offline AlbinoRhino

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Re: Arrow Spine
« Reply #2 on: February 16, 2017, 11:28:09 AM »
Is that 250 with a carbon express arrow?

Last season it was a BE Carnivore which I was intending to run again but open to others as well

Offline Roperfive88

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Re: Arrow Spine
« Reply #3 on: February 17, 2017, 07:23:15 AM »
I shoot 30" gold tip  hunter pros at 70 lbs in 300 spine. Thats what gold tips chart on the box calls for.

Offline highside74

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Re: Arrow Spine
« Reply #4 on: February 17, 2017, 08:30:39 AM »
My first question is why do you feel you need such a heavy arrow? Your setup with a 100gr tip is going to carry 70ish # of kinetic energy. The arc on that almost 500gr arrow isn't worth it. Now if you were shooting traditional that's a different story but your new modern gear doesn't need it. Maybe you don't want to have to buy new broadeads along with your arows and 125s are what you have. The extra 25 in that broadhead is plenty of extra foc and I don't see the need for the extra 50. My arrow is 408gr at 29inch shot out of a 63# bow. It packs a punch worthy of any north American big game animal.

Now I'll step down off my soapbox and say...

You will need a stiff arrow. If your not sure yet about the extra 50gr you can get a 300 and cut at 30 and trIm it down until it tunes. Personally I shoot an arrow 1 inch shorter than my draw length. So you should be able to trim 2 inches off if it isn't stiff enough at 30 inches. And you can back some # out of your draw after that to help tune your arrow also.

Always error on the side of slightly to stiff if the chart says you are on the edge of 2 spines.


Offline theleo

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Re: Arrow Spine
« Reply #5 on: February 17, 2017, 09:16:54 AM »
What are goals for the arrow as far as weight and FOC? If you liked what you had last year I'd leave them as is or at most add the 50gr insert and drop down to a 100gr head. 

Offline AlbinoRhino

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Re: Arrow Spine
« Reply #6 on: February 17, 2017, 09:26:28 AM »
What are goals for the arrow as far as weight and FOC? If you liked what you had last year I'd leave them as is or at most add the 50gr insert and drop down to a 100gr head.

I hadn't decided on doing the insert for sure but was just going to try it out and see how it flew.. only reason it intrigued me is by the calculators I found it would bump my foc to 15%... otherwise I'm happy with my 450 grain set up

Offline AlbinoRhino

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Re: Arrow Spine
« Reply #7 on: February 17, 2017, 09:29:44 AM »
My first question is why do you feel you need such a heavy arrow? Your setup with a 100gr tip is going to carry 70ish # of kinetic energy. The arc on that almost 500gr arrow isn't worth it. Now if you were shooting traditional that's a different story but your new modern gear doesn't need it. Maybe you don't want to have to buy new broadeads along with your arows and 125s are what you have. The extra 25 in that broadhead is plenty of extra foc and I don't see the need for the extra 50. My arrow is 408gr at 29inch shot out of a 63# bow. It packs a punch worthy of any north American big game animal.

Now I'll step down off my soapbox and say...

You will need a stiff arrow. If your not sure yet about the extra 50gr you can get a 300 and cut at 30 and trIm it down until it tunes. Personally I shoot an arrow 1 inch shorter than my draw length. So you should be able to trim 2 inches off if it isn't stiff enough at 30 inches. And you can back some # out of your draw after that to help tune your arrow also.

Always error on the side of slightly to stiff if the chart says you are on the edge of 2 spines.

I just like max momentum is all.. I'm required to shoot a 420 grain anyways so I added the 125 for foc and my long range groupings are much better... I'm most likely not going to end up gettin the added inserts but if I don't am I " too stiff" with the .250 and should i go with the .300s I don't think I meet arrow requirements with the BE carnivore .300 spine

Offline highside74

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Re: Arrow Spine
« Reply #8 on: February 17, 2017, 11:00:47 AM »
I am a huge fan of Goldtip XT Hunter arrows. Tough as all get out and great tolerances. These are in the similar price point as your Black Eagle. The 300 spine XT are 9.3gr per inch and their chart says 300 all the way for your setup. With your broadhead at 125 and generic numbers for insert, nock and fletch you should be in the 430gr area cut at 29in. That is what I would do and you will be very happy with Goldtip arrows. 

Offline AlbinoRhino

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Re: Arrow Spine
« Reply #9 on: February 17, 2017, 11:05:07 AM »
I am a huge fan of Goldtip XT Hunter arrows. Tough as all get out and great tolerances. These are in the similar price point as your Black Eagle. The 300 spine XT are 9.3gr per inch and their chart says 300 all the way for your setup. With your broadhead at 125 and generic numbers for insert, nock and fletch you should be in the 430gr area cut at 29in. That is what I would do and you will be very happy with Goldtip arrows.

I used em before and really liked em tried BE due to a clearance sale.. got 6 carnivores for $30 so I gave em a shot I was considering going back