It's no harder to get the correct spine woodies than it is for aluminum. Wood shafts are cataloged by spine range for a 28" draw. Like a 60-65 would be the right arrow to try for a bow drawing 60-65 pounds at 28". Make up a couple of arrows full length and shoot. If they act weak - which is what you want at this point - then cut a half inch off and try again. Keep shooting and cutting until the arrows are the right spine for your bow.

If the arrow winds up spining up shorter than you want to shoot, then you go up to 65-70 spine shafts and do the process again. If the arrow winds up longer than you want to shoot, then you drop down to 55-60's and try them.

I don't have the luxury of being able to cut my wood arrows down. When I find some shafts long enough, I taper the nock end, taper the front end and that's my arrow. So, I have to figure out what spine I need before I buy shafts. I have to know what my draw weight is at my draw length.

I know my arrows will have to finish out a minimum 31 1/2" to back of point. For each inch past 28", you add 5 pounds. At 31", I add 15 pounds. Then another 5 pounds for the extra half inch. So, for my 50 pound bow, I need 65-70 spine shafts.

Of course, if your arrows are shorter than 28", you reverse the process. Subtract 5 pounds per inch. So, you shoot a 60 pound bow and use a 26" arrow - you'll likely wind up with a 50-55 spine.

Here's a link to AMO standards. Got a whole lot of useful info on it, including a wood arrow spine deflection chart. It's in PDF format, so you need Adobe Acrobat to open it. http://www.texasarchery.org/Documents/AMO/AMOStandards.pdf

Texasarchery.org has a whole lot of great stuff on it. Click on "Documents" in the side menu.