Need arrow advice for 70-75# longbow

[Jim Wright]

Steve, it would not hurt to check with your bowyer for direction but 80-85 spine Douglas Fir 510 to 520 grain raw weight, with 4 or 5 coats of gasket lacquer and 160 grain points would finish out right at 750 grains at your 30" length.

[Jim Wright]

Steve change that to 85-90 spine, I forgot your 29" draw changing the 70 lbs @28" to 74/75 lbs.

[Benny Nganabbarru]

Your gasket lacquer must be heavier than the exterior all-weather timber varnish I use.

[Jim Wright]

Ben, I suspect that different sealers on the same raw weight shafts would yield different final arrow weights. I have only used gasket lacqer. I just made a couple of dozen Douglas Fir up and unless I am figuring wrong, I believe that my suggestion on raw shaft weight Douglas Fir to finished arrow weight is correct.
Just for information's sake I have also noticed that gasket lacquer on Douglas Fir adds just about twice as much weight as it does on Cedar due to the physical differences in the wood. Also I use water-based stains except for once when I put on some oil-based and I remember the finished arrows came out a bit heavier.
 How are things "down under"? Hope you are doing well.