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pound draw weight, 350 grain arrow. While
most 'hunting' arrows will have a mass
weight that is well over this standard, there
are a few ultra-light arrows that can come
in under IBO. There are also state legal
minimums that you should consider. Here
in Montana, the legal minimum weight for
an arrow is 300 grains with the broad head
attached. Idaho uses the same regulation
as Montana. Washington's regulation (at
the time of this writing) states that the
arrow must weigh 6 grains per pound of
draw weight and be a minimum of 300
grains. If I were to use my current setup
in Washington, I'd be asking for a ticket as
my arrows are well under 432 grains that
I would be required to have.
It's easy to determine the mass weight
of your arrow, even if you don't have a
grain scale. Take the GPI of your arrow
multiplied by your draw length then add
145 (this assumes you are using 100 grain
heads, use 160 if you prefer 125 grain
heads). Most fletches on the market weigh
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about 6 grains, inserts and nocks weight
about 12 grains each, there is a few grains
worth of glue, and a 100 grain point. My
Hexx arrows have a mass weight of 380
grains on the grain scale - They are cut at
29.75 inches, have an arrow wrap, 3 Blazer
vanes, H nocks and standard insert, and I
use 100 grain points. If I use my formula I
get 7.9 x 31 = 244 + 145 = 389. My Gold Tip
Target arrows weigh in at 460 grains cut at
30 inches, with X-vanes, pin bushings and
nocks, and 100 grain points. 9.9 x 31 =
307 + 145 = 452. Pretty close, right? There
will be some slight variation based on the
actual cut length of the arrow, and the use
of products like arrow wraps (many Easton
arrows are coming from the factory with a
shrink-fit wrap already on them) and pin
bushings, but for the most part it will give
you a close measurement of arrow weight.
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FRONT OF CENTER
There is another factor that is related to the
mass weight of an arrow - Front of Center.