I've been reading several posts on arrow spine and it's left me confused. What are the problems with an under spined arrow?
What are the problems with an over spined arrow (I've only heard of being underspined, I assume because everyone wants a lighter arrow)?
And the charts are just a starting point right?

I was shooting GTpro hunters 7595's Hardwoods (spine is 300) and they shoot fine, quiet, and accurate (with vanes or feathers).

I just bought some ST AXIS 400's (spine is 400) and they shoot well but the arrows I put feathers on make noise. My thought is they are probably a little underspined and the noise is caused by the feathers working (over working).

Your thoughts?

Thanks

Feathers will always make more noise than vanes. Don't know if being underspined will make it any worse, but I guess it could could if the arrow was flexing as it comes out of your bow. Try some with vanes and see how they sound, or make sure your bow is tuned to the new arrows.

Old feathers can make more noise than new vanes, but normally feathers in good shape don't make as much noise as you think unless they have a radical helical to them. And once you damage a vane they make just as much noise if not more than a feather fletch will.

Weak spined arrows have problems with consistency, and can also waste energy. You will have trouble getting them to group well or tuning them, especially with fixed blades attached. Normally a stiffer spine is not that bad of a thing, they fly pretty well and usually tune ok. However a really stiff spine can be tricky to bare shaft or broad head tune sometimes. Normally the only thing you are giving up with an overly stiff spine is you are shooting an arrow that is heavier than you need. Not always a bad thing either.

I think your fletchings making noise might have more to do with how they are fletched than the spine being off. I have shot pretty weak arrows with feathers and didn't notice they made any more noise than usual. You might also have some sort of contact issue.

Paul

As for myself I think Gt's are on the weak side of the spin issue. Don't care for them anymore.