Arrow Spine Questions

worm567952 · 07-29-2009, 06:51 AM

my setup is a PSE DreamSeason Xforce with 29" draw 70lbs and I want to shoot Easton Axis Nfused 28" arrows so my question is should I use the 400 or 340 spine or should I use a different kind of arrow???

thanks for the help

Wes

BGfisher · 07-30-2009, 06:27 AM

400? No way. 340 might work, but I'd lean toward a 300 if you want to know the truth.

It might be worth it to borrow a couple arrows to find out what spine works best for you. They wouldn't necessarily have to be N-fused arrows, Just a couple 340 and a couple 300 spines to see which works the best. If the 340 tends to show a little on the light side you could always turn the bow weight down a touch. Something closer to 67# or so. You aren't going to be hunting anything that needs more weight unless you're going to Africa.

When tuning the limb bolts can be one of the most useful methods of getting good arrow flight, and they are already paid for.

kickin_buck · 07-30-2009, 10:12 AM

400's are going to be way too weak. Bare shaft tune a 340 and see what you get. It would help to know what your BH gr is going to be and the total length of the arrow.

Providing the following information in case you have never bare shaft tuned before...

At 15 yards, shoot a fletched shaft. Next, shoot a bare shaft arrow (same length and BH just no fletchings). If the bare shaft and fletched shaft group together, you are spined good.

(Right handed shooter) If the bare shaft groups right of the fletched shaft, it indicates your spine is too weak, if the bare shaft groups left of the fletched shaft, it indicates you spine is too stiff.

If you find out you are too weak or stiff, you could always play around with BH weight and shaft lengths to try and get spined correct, or make a move to a different shaft spine all together. However, if you decide to move from let's say 340's to 300's, you should still bare shaft tune as you may now be too stiff and still have to adjust shaft lenght and/or BH weight.

TFOX · 07-30-2009, 07:32 PM

I wouldn't even think of shooting anything lighter than a 300 spine out of that bow at that poundage.