Good stuff from Brian, {Carbon Caster} but I would go with a lighter spine than the 150 and choose a 90 or 500 spine with a 175 gr point for starters.
I shoot very Heavy arrows in the 600 to 800 gr range from my 50# bows for hunting, and almost all of them like a 500 spine with heavy point weight from 200 to 400 grains. If you are only shooting paper you won't want the total weight I shoot.
Main thing is don't go to light in total weight. it is hard on the limbs, unless you have a limb designed for light arrows like some of the ILF Olympic limbs.
Start with them at 30" and tune from there. The shorter they are the stiffer they are . Once cut you can't reverse it.
You can build out the shelf to accommodate a weak spine, or shorten the arrow, and go to lighter points, but there is little other than try more point weight that you can do for a shaft that is to stiff.
Get an assortment of points for tuning, start with 6 of each in 145,175,200,250 and if you want heavy 300.
You also need feathers not plastic vanes.
What is the bow make and model, this might help in steering you to the right choices.
Check your PM's .
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