Only shafts I use these days are Sitka Spruce. I found them to be very strong and consistent in weight.I buy them in a batch of 36. I ask my supplier to match them as good as possible. They are handspined and differ as much as +/- 1 lbs. I get them around the 60 lbs and the bare shafts are normally around the 330 grains. Sometimes I see that there are two or three weight ranges in one batch. i.e. 320, 340 and some 360's but that's ok.
I make my own cresting with paint and seal the remaining part with tung oil. Once they are done and have dried, I weigh them again. Some shafts absorb more paint or oil then others. Then I have the final weight and start selecting. I select a dozen which are very close in weight, think +/- 2 grains. Then I fletch them. With a 100 grains fieldpoint they end around the 450 grains as average.
The disadvantage of SS is that it isn't very straight. Therefore I cut them on lenght and install the nock and point first. I spin them on my hand to see if they wobbble. Most do. Then I straighten them with the screwdriver method, piece of a cake. I get them as straight as carbons. After I am done with the screwdriver, they stand dead-stil on my hand when spinning.
After the straitening I paint them and seal them. In this way I don't damage the paint or sealing and the fletching isn't in the way with the screwdriver..
Shafts which are out of the weight range, go apart. When I have 12 shafts left, I order a new batch, and the weight matching begins all over again. Sometimes the shafts which are out of weight range, fit in the new batch.
Once SS is straight, it stays straight.