Arrow Spine Question

[M6A2REPR]

I am new to archery (a little over a month).

My bow is a Halon 6 70lb/ 29 inch draw maxed out. Current arrows are Victory RIP 350 spine cut to 28.6875 carbon to carbon with a Victory 60 grain top hat insert. The arrow extends 2.75 inches beyond my QAD rest. I have started breaking arrows (from shooting groups) and will start replacing them 6 at a time.

Total arrow weight is 424 grains shooting around 305 fps

I plan on using this setup with 100 gr and 125 grain broadheads.

1. My question is am I currently underpinned?

2. Can I remove 1.5 inches off the arrow and be okay, or do I need to move up to the 300 spinned arrow?

3. If I can remove 1.5 inches off the 350 spinned arrow can I add more weight to the front to get a higher FOC? How much?

Thanks in advance.

[Drycreek3189]

Are your arrows flying like darts or fishtailing ?
At what distance are you breaking arrows while shooting groups ?

You might just have to cut a couple arrows off to answer question no. 2

Spine charts are a guideline. Actually shooting with different setups is real-world.

[M6A2REPR]

I see some fishtail in flight past 40 yards.

Arrows are breaking while shooting groups at 40 yards

[KenWood]

Put a fixed blade broadhead with a large cutting diameter on. Nothing will let you know your out of tune or under/overspined faster. Paper tuning is the best way to know. If you cannot punch bullet holes no matter how you move rest you have a spine issue.

[KenWood]

Spine or form issue. Sorry forgot that one.

[Drycreek3189]

If I were hitting arrows at 40, I would change very little in my set up. But, I can't shoot that well anymore.

[muddyfuzzy]

yes sir, you are underspined. Cutting your arrows down even to the length you are proposing you are still way under. I wouldn't even put you in a 300, for guys shooting your specs 250's are the best fit if you want any big FOC to speak of. Otherwise you would be looking at something in the 14% range still maintaining a respectable spine in the 300. Shoot me a PM, I would love to help.

You would also benefit greatly jumping up to a heavier arrow IMO.

[M6A2REPR]

My most recent 40 yard group.

I am not to concerned with extremely high FOC yet, but I do want to be as close to 15%. My first concern is getting the proper spin. I will only be hunting whitetail for know.

It sounds like I will moving to 300 spine on my next trip to the bow shop.


Thank you for your help.

[Mudslinger]

yes sir, you are underspined. Cutting your arrows down even to the length you are proposing you are still way under. I wouldn't even put you in a 300, for guys shooting your specs 250's are the best fit if you want any big FOC to speak of. Otherwise you would be looking at something in the 14% range still maintaining a respectable spine in the 300. Shoot me a PM, I would love to help.

You would also benefit greatly jumping up to a heavier arrow IMO.

Listen to this guy, he definitely knows his stuff and can help you!

[enewman]

Listen to this guy, he definitely knows his stuff and can help you!

Listen yes but don't look at him. I saw a family pic today. It was a great pic. Would have been better if that hairy dud had not been in it


Love ya muddy

[M6A2REPR]

I would like to keep the total arrow weight below 450 grains including a nockturnal lighted nock.

Since I have to change spines I might even consider changing to the .166 dia shafts. I just want to be able to use normal 8-32 components.

[enewman]

[ATTACH]778500[/ATTACH]
My most recent 40 yard group.

I am not to concerned with extremely high FOC yet, but I do want to be as close to 15%. My first concern is getting the proper spin. I will only be hunting whitetail for know.

It sounds like I will moving to 300 spine on my next trip to the bow shop.


Thank you for your help.

Normal FOC = 0 percent to 12 percent
High FOC= 12 percent to 19 percent
Extreme FOC =19 percent to 30 percent
Ultra Extreme FOC = more than 30 percent

Your going to have a hard time getting 15% with lighted nock They are foc killers. If your trying to stay verly light you need to look at a 300 spine less then 9 gn per inch. At this point get your arrows from muddyfuzzy.

[old killer]

I see some fishtail in flight past 40 yards.

Arrows are breaking while shooting groups at 40 yards

Any fishtailing past 40 is not spine, Either wind or a vane came off.

[M6A2REPR]

Shot at 20 and 30 yards last night with and without a broadhead. I did not want to extend to 40 yards as I did not want to miss the target completely.

I noticed the broadheads were hitting 4-6inches to the right depending on range from target. The were however hitting with minimal if any vertical travel change.

I asume this confirms underspined.

[KenWood]

Or rest out of wack. I would paper tune. I don't know how the specifications differ from my z7 extreme to your halon but I shoot 340 Easton bloodlines 29" with a 29" draw. They punch bullet holes in paper and broadheads will group with field points as far as you want to shoot it. I bet you get a tear to the left. If you can't fix it with moving your rest then get a stiffer spine.