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Depending on the IBO of your Bow, with a 70# DW, 28.5" DL, 27.5" arrow length, 125 grain broadhead and 300 spine, I would use standard inserts or you will probably be underspined.
 
What is the best suggested length at 9.3 grains per inch?
Depends on your setup. For your setup, if you use a 300 spine I would keep the length around 27.5". I like my arrow length at least 1" past my arrow rest. Keep in mind, increasing arrow length will weaken arrow spine. It is definitely better to have your arrow spine a little on the stiff side. My draw length is 29" and my arrow length is 27.5", from the valley of the nock to the end of the shaft.
 
Discussion starter · #13 ·
What is the best suggested length at 9.3 grains per inch?
Depends on your setup. For your setup, if you use a 300 spine I would keep the length around 27.5". I like my arrow length at least 1" past my arrow rest. Keep in mind, increasing arrow length will weaken arrow spine. It is definitely better to have your arrow spine a little on the stiff side. My draw length is 29" and my arrow length is 27.5", from the valley of the nock to the end of the shaft.
Will 27.5 get me 1” past the arrow rest? Using an QAD HDX.
 
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