[Diamond_Victory]

I am shooting carbon express 300's, at 27.5 inches. They are 8.1 grains per inch and I am thinking of switching to Easton Axis 500's, they also are 8.1 grains per inch. I do not think that an adjustment from arrow to the other like this should matter...........do you?????

Shooting diamond victory dual cam, 70#s, 100 grain tips.

Let me know what you guys think....

 

[Archersteve]

Define adjustment

Because the Axis is a smaller diameter (double check this but I'm pretty sure they are), the nock point or rest height will differ. It will not usually cause a tuning problem, but it will create a sight change.

 

[BowRegards]

Yes, I feel there will be a difference. One ill shoot betterout of your bow than the other. You'll have to try the 500s to see which is best for you.

 

[Doum]

Easton axis 500 are WAY underspined for your setup. I suggest the 340 if you have a long arrow, more than 28''. The 400 would be ok, on the weak side IMO.

 

[Diamond_Victory]

I am shooting the CX 300s now and they are the same weight, how would I be way underspined? Not arguing with you, just wondering. I was figuring the nock point would move because the Axis are a smaller diameter. I shot the Axis's in my Martin two years ago and they were very strong arrows, held up well. I was thinking the nock point would be the only thing that would change though.........sound right????

 

[buckfeverben]

I am shooting the CX 300s now and they are the same weight, how would I be way underspined? Not arguing with you, just wondering. I was figuring the nock point would move because the Axis are a smaller diameter. I shot the Axis's in my Martin two years ago and they were very strong arrows, held up well. I was thinking the nock point would be the only thing that would change though.........sound right????

Same arrow weight is one thing, different arrow spine is another. Spine is a rating for how stiff a given arrow shaft is. Having a shaft that is too weak in spine, will cause you lots of tuning headaches and you will likely not shoot as accuratley as you would properly spined arrows. 340's would likely shoot much better, they will be heavier though.

 

[Diamond_Victory]

ttt

 

[nuts&bolts]

ttt

Carbon Express CX Select 300 shafts = stiffness rating is

0.370 inches

of deflection in a spine tester with a standard 1.8 lb weight
where the supports are 28" apart.

The unit weight of a Carbon Express CX Select 300 shaft = 8.1 grains per inch
Outside diameter is 0.291 inches.



Easton Axis 500 shafts = stiffness rating is

0.500 inches

of deflection in a spine tester with a standard 1.8 lb weight
where the supports are 28" apart.

The unit weight of a Easton Axis 500 shaft = 8.1 grains per inch
Outside diameter is 0.258 inches.


The two shafts weigh the same.
They are noticeably different outside diameters in size.

The stiffness rating is not even close.


So, if you want to switch to the Easton Axis shafts,
then like Ben says,
you should consider the Easton Axis 340 shaft.



Easton Axis 340 shaft
Have the shaft cut at 28.75"
(yes, this is longer than what you are used to, but the 340 shaft is a bit stiff)

Do NOT use an arrow wrap. This shaft is too stiff as it is, hence the longer recommended cut length.

Use your 100 grain broadheads.

Use 2" Bohning Blazer vanes.


Est Velocity = 274 fps
(I assumed you have the 80% letoff for your bow).

5.971 grains per lb of draw weight

FOC = 9.93%

69.61 lbs of kinetic energy



in a spine tester

 

[Diamond_Victory]

N&B what do you think of the CX 300s I am shooting now? Do you think they are spinned alright?

 

[Dodgedude]

Yes I do..

Quite a bit actually. GPI is but one thing to consider in choosing arrows. Even at your arrow length, a 500 spine arrow is for a shooter pulling considerably less than you are.

My advice is to follow Nuts&Bolts advice.

 

[nuts&bolts]

N&B what do you think of the CX 300s I am shooting now? Do you think they are spinned alright?

If your bow has is set for 80% letoff,
then the Carbon Express Select 300 shafts
with the 100 grain broadheads
and 2" Blazer Vanes are a perfect match.

 

[Archersteve]

Same arrow weight is one thing, different arrow spine is another. Spine is a rating for how stiff a given arrow shaft is. Having a shaft that is too weak in spine, will cause you lots of tuning headaches and you will likely not shoot as accuratley as you would properly spined arrows. 340's would likely shoot much better, they will be heavier though.

I can't believe I overlooked the spine difference. You should always be "correctly spined" to over spined. And when comparing arrows of different spines, all bets are off.

Thanks for catching that one buckfeverben.