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Spine wt. on arrows

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Ranger B:
If you buy shafts and they say they have the spin on them I assume that the spine wt. is based on the 31" arrow I'm buying so if I cut them to 28" I just increased the spine wt.  Is there a rule of thumb for how many #s you gain in spine wt. for an inch cut off an arrow?

Pat B:
Jimmy, I believe the spine weight is based on a 28" arrow. For each inch over that subtract 5# and for each under that add 5#.      Pat

TRACY:
Exactly what Pat said.

Pappy:
What Pat and Tracy said. :)
   Pappy

Mechslasher:
to further confuse you, the spine is actually measured at 26" for a 28" arrow.  pat's right on with the length/spine calulation.  you then have to take into account what type of bow you shoot as well as point weight to come up with the "right" spine for your setup.

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