Mass Weight

A common question is; “What should I expect for mass weight from Douglas fir?”

Without getting into the details of how much you are going to cut off due to your draw length or what you are going to add back on as finish, point weight, nock, fletching etc. I will leave that math up to you. The table below should aid you with a starting point for your raw shaft from which to start.

Please Note

These numbers were 11/32" diameter and full 32" length
23/64" may be a little higher, perhaps 10 grains
Grain weight range represents 60-70% total numbers for any given spine group. The remaining 30-40% will fall outside this range, some lighter and some heavier.
Unless specified at time of order we reserve the right to ship what we have available at that time.
Within these numbers lie the best odds for repeat orders matching up.

Spine weight	Grain Weight
30-35 lb	330-380 gr

35-40 lb	340-380 gr

40-45 lb	350-400 gr

45-50 lb	360-410 gr

50-55 lb	370-420 gr

55-60 lb	380-430 gr

60-65 lb	400-450 gr

Spine weight	Grain Weight
65-70 lb	410-460 gr

70-75 lb	430-480 gr

75-80 lb	440-490 gr

80-85 lb	470-520 gr

85-90 lb	480-530 gr

90-95 lb	500-540 gr

95-100 lb	510-550 gr

Spine: “The stiffness of the shaft is known as its spine, referring to how little the shaft bends when compressed. Hence, an arrow which bends less is said to have more spine. In order to strike consistently, a group of arrows must be similarly-spined. Higher draw-weight bows will generally require stiffer arrows, with more spine (less flexibility) to give the correct amount of flex when shot.” Wikipedia

Grain: “ A unit of weight in U.S. Customary System. Traditionally arrows and shafts have been weighed in grains, 437.5 grains equals one ounce. ”

If you want more technical information please go to Stu Miller's Dynamic Spine Calculator.