Bare shaft tuning

Crossbow Hunting

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flightattendant100
Posts: 3856
Joined: Thu Jul 30, 2009 4:06 pm
Location: Ft. Worth, Texas

Re: Bare shaft tuning

Post by flightattendant100 » Wed Jan 31, 2018 11:19 am

SEW wrote:
Wed Jan 31, 2018 8:26 am
I’m shooting 20” arrows out of my 380,400,405. That length requires more spine than shorter arrows. I do spine index and see a noticeable difference in accuracy. Of course, the shorter the arrow, the less spine indexing will help, as well as with shorter ranges. At 80-100 yds and a M405 , a 20” Arrow will significantly benefit from spine indexing, and I expect spine matching.
Do the 380,400,405 benefit from shooting the 20" arrows as opposed to 18",17"?

SEW
Posts: 1518
Joined: Fri Dec 12, 2014 9:55 am
Location: NE Arkansas

Re: Bare shaft tuning

Post by SEW » Thu Feb 01, 2018 9:00 am

Likely not. I'm a long range shooter and want(ed) the lowest foc'd arrow yet keeping weight low. The longer the arrow, the less FOC required. Likewise, I believe that longer arrows have more planning than shorter - probably insignificant between 20" and 18". But, the combination of the slight increase in ballistic coefficient and the lessened FOC requirement (for minimal necessary foc to get max accuracy) helps keep a flatter trajectory.
No, I'm not recommending 20" over 18". With the BD400, and M405s , I'll likely end up with 19" and 18" for the M380.

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