Help settle an argument

[croix]

The arrows in question are being shot from a 28" draw.  They are 31", without broadhead weigh 390gn, have a spine of .343, 100gn broadheads and and FOC of 10.2%.  Total arrow weight is 490gn.

.343 spine with 100 grn BH I would not go beyond 30" for arrow length - regardless of draw length.

[DoubleJ]

125gn broadhead balance it out a bit better?  Then it's over 500gn and would slow way down

[Lowedog]

I would say that with a 31" arrow you may be a bit under spined.  Going to a 125gr head would make it more so.

[croix]

I would say that with a 31" arrow you may be a bit under spined.  Going to a 125gr head would make it more so.

 

http://www.huntersfriend.com/carbon_arrows/hunting_arrows_spine_chart_by_deflection.htm