Does anyone have a formula for figuring the weight of POC shafts?

4-5 grains per inch? Or; what does one guestimate, with wood?

The ones I have now are 5/16; but I'm willing to learn about others too.

Because of their irregularity I don't believe you can estimate the weight of wood shafts by the inch. On 11/32" cedars cut to 29" I was getting 475 to 550 gr(+/-)finished arrows with 125 gr points. For ash about 100gr heavier.

A 32" 5/16 shaft weighs between 320 and 370 gns typically; 11/32 from 390 to 450 gns. The weights can vary even more depending on the density of the wood. This is for POC. 11/32 shafts of Ash are usually 100 grains more and Hickory is another 100 grains on top of ash. This is very rough-some Ash weighs more than Hickory and I have got POC that weighs 570 gn for a 32" shaft. I don't think there is a formula that's reliable that's why I use a scale and suspect others do too.

No formula. Trees grow differently as to their envirnoment.

From the two sets of numbers, POC would - roughly, go around 10 grains per inch.

So, if I figure on 9, I should come out on the light side??

Not going to get precision, that I get.

Thanks...anyone else have other numbers to adjust the ballpark figures?

They are a natural material,I have had two different groups of POC of the same spine weigh as much as 50-70 grains more then the other group.No formula I've heard of.

Snag is right on, but I had to scale 600 60/65 and 55/60 POC last week.  All were 23/64 and the low was 270 and the high was 435.  The highest percentage of the shafts fell into the 340-360 range.  If you weight enough shafts you can find a pattern, but like Snag said there is no formula because trees grow differently. dino