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Tuning for "heavier than normal" spine #15103552 08/02/20
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Gun_Geezer Offline OP
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With 47# recurve in for repairs, I decided to tune some carbons for my 57# recurve. For my draw length and that weight, all the charts and those I've asked indicate a 400 spine as the place to be.

Now, I reasoned that if I went up to a 340 spine (stiffer) shaft I'd still be able to get a tuned arrow by using a combo of longer shaft and heavier point, thus getting higher FOC and higher overall weight. Maybe making a fine adjustment using brace height.

I am wrong here?

Last edited by Gun_Geezer; 08/02/20.
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Re: Tuning for "heavier than normal" spine [Re: Gun_Geezer] #15103624 08/02/20
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JGray Offline
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Correct - heavier brass inserts are an option as well. 3 Rivers Archery has a spine calculator on their site that will let you plug in your bow info and help you get a feel how shaft length, spine and point weight, etc. impact the dynamic spine. It's helpful in getting to a starting point on how much more point weight or shaft length you'll need going from 400's to 340's.

I'm shooting bows in the mid-50 lb range with 340 spine shafts at 29" with 50 gr brass inserts and 175 gr points. How your sight window is cut is a variable in the equation also. I cut my sight windows anywhere from right at center up to 3/16" past center. Past center allows you to shoot a heavier spine shaft.

Re: Tuning for "heavier than normal" spine [Re: Gun_Geezer] #15103805 08/02/20
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Gun_Geezer Offline OP
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I've been using / referencing the 3R calculator. Amazing tool. Tried to us the "Other" shaft selection and it kind of blows up. They have an error in it someplce.

Re: Tuning for "heavier than normal" spine [Re: Gun_Geezer] #15104865 08/02/20
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MontanaCreekHunter Offline
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You are correct. But unless you have a really short draw I would keep my arrows as short as possible. Stiffer arrows are going to more times than not hit on your riser and or rest.


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Re: Tuning for "heavier than normal" spine [Re: Gun_Geezer] #15119267 15 hours ago
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CRS Offline
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I have done exactly that when wanting to shoot a heavier arrow out of my traditional bows.

I prefer heavier arrows in the 600gr range when hunting elk, moose and using three bladed broadheads.

My shot distances are close, I cannot remember the last time I took a shot over 20 yards. So arrow weight is not factor in to arrow trajectory at short distances.

I have a few bows that are tuned for both 400 and 340 spine.

My favorites broadheads right now are Cutthroats for two blade and VAP's for three blade.


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