Under spined but flying great??

[tmerk81]

Question for you Mathews V3 shooters: I though I was borderline under spined with my current set up: 30.5 DL, 70 pound limbs maxed, Easton Axis 5mm Match Grade 300 spine at 29” carbon to carbon, standard inserts, 125 grain heads. Was testing broadheads today and found that 150 grain Day Six heads flew the best - surely that would be way too weak, but the V3 loved it! Who else is shooting what should be a weak spine and having good results? Here is what the software shows for that combo:

 

[Rob5589]

Those calculators are a baseline. If it tunes, it tunes. I use close to the same set up as yours (29" .300, 150 total up front) but a few lbs lighter draw weight. I achieved excellent tune and flight with broadheads.

 

[Hoodie]

"Underspined" means the dynamic spine of the arrow is too weak for it to fly correctly. If your arrows are flying great they aren't underspined.

 

[Where's Bruce?]

If they shoot consistently at ranges you need for hunting, that's all that matters. Confidence comes from results.

 

[manitou1]

Yup, not underspined for your bow's force curve if they are flying great. No worries.

 

[dtrkyman]

These calculators now seem to recommend rebar for any bow over 65lbs!

Accurate is accurate, good flight is good flight!

 

[magtech]

Don't worry about it. Worry about the results. I had a 28" arrow that was overspi ed for the weight. Bought new arrows and cut a few to 27" on accident. Now it says way overspined.... but they shoot as good or better than my 28" so I don't care.

 

[Bjon8912]

Same here. Arrows that shouldn't fly correctly do. If it works, run it!

 

[jmez]

Spine, Meh. In over 30 years of archery I have yet to have a problem related to arrow spine. The most over blamed "problem" in archery.

Forget the calculators and internet experts. Shoot them. If they tune and shoot your are good.

 

[Illustrator76]

Spine, Meh. In over 30 years of archery I have yet to have a problem related to arrow spine. The most over blamed "problem" in archery.

Forget the calculators and internet experts. Shoot them. If they tune and shoot your are good.

I agree. I used to use calculators as well, but found once I started tuning my fixed blade broadheads that my "optimal spine" was indeed 300 and not 350 as the calculator suggested.

 

[Marble]

I would just put a broadhead on it and see how it flies.

Sent from my SM-G986U using Tapatalk

 

[tmerk81]

Here’s what a 150 grain Day Six BH and 125 grain FP (I don’t have 150s) look like at 20 yards. What next, other than step back to 30,40, 50, etc?

 

[tmerk81]

Here’s what a 150 grain Day Six BH and 125 grain FP (I don’t have 150s) look like at 20 yards. What next, other than step back to 30,40, 50, etc?
View attachment 454123View attachment 454124

A 125gr TOTA 4 blade V series was nowhere close to this.

 

[MattB]

You could probably retitle this thread “properly spined but over-focused on the wrong thing”.

 

[SDHNTR]

Are they flying good with fixed blade broadheads? And grouping together with field points? That will tell you what you need to know. Anything will fly ok with just field tips.

 

[tmerk81]

You could probably retitle this thread “properly spined but over-focused on the wrong thing”.

Haha. Point taken. What should I be focused on?

 

[tmerk81]

Are they flying good with fixed blade broadheads? And grouping together with field points? That will tell you what you need to know. Anything will fly ok with just field tips.

Yes. First shot with BH was dead nuts. Shot two more arrows - one BH, one FP and they hit in dang near the same hole. That’s what the picture is showing.

 

[MattB]

Haha. Point taken. What should I be focused on?

Broadhead flight.

 

[KY_Whitetails]

If it groups bare shafts, field points and broadheads you're good