Depends on which arrow for which bow. Varies tween 9.6 and 10.2 gpp. I don't normally run insert weights but if I'm running light heads, say 100 grains, I'll put 50 grain insert weights in. Or if I damage a shaft and can trim and reuse I'll add extra insert weight to stay with my standard heads. I build my arrows with the weight heads I want to use in mind. I rely on the 3Rivers dynamic spine calculator to get me a working combination then leave arrow long and trim to fit.
Depends on which arrow for which bow. Varies tween 9.6 and 10.2 gpp. I don't normally run insert weights but if I'm running light heads, say 100 grains, I'll put 50 grain insert weights in. Or if I damage a shaft and can trim and reuse I'll add extra insert weight to stay with my standard heads. I build my arrows with the weight heads I want to use in mind. I rely on the 3Rivers dynamic spine calculator to get me a working combination then leave arrow long and trim to fit.
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I put my info in the spine calculator on the 3 rivers site and my numbers are 14 apart with the bow spine being higher .
Your string strand count and shelf cut make a difference in the calculations so be sure they are correct. Also did you measure your actual draw length or do the wing span calculation? That calculator is only as good as what we plug in.
Also it could be you are just that far off and need to adjust your arrow set up to get closer.
Yes there is a personal calculation you can set as well IF your set up is tuning out perfectly but I don't have to adjust it.
Your string strand count and shelf cut make a difference in the calculations so be sure they are correct. Also did you measure your actual draw length or do the wing span calculation? That calculator is only as good as what we plug in.
Also it could be you are just that far off and need to adjust your arrow set up to get closer.
Yes there is a personal calculation you can set as well IF your set up is tuning out perfectly but I don't have to adjust it.
Sent from my SM-G892A using Tapatalk
I put in the correct information and marked an arrow arrow the front of the riser when at full draw. I have had guys tell me that I need to cut my arrows down . I changed the length the of the arrow in the calculator to 31 instead of my 34 and it brought the spine numbers to within the 2 pounds that the chart recommended. I just haven’t physically cut the arrows .
I use whatever arrow weight gets me a good tune and trajectory. I have a 32" draw so I get lots of free energy, and that makes life easy for me. Really, I just tune my arrows and go hunt. Right now I'm at ~450 grains, out of my Black Widow. 43lbs @32"... 125 grain heads, 11 gr HIT insert. I haven't chronod this setup, but I know it's more than 175fps. Cause I was getting 175 with a 500 grain arrow last fall.
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