Same here as Guy.
I go thru them to pull straight 48" dowels, or relatively straight. Then I go thru the selected ones and look at the grain. I ditch the cross grain ones and get the ones with grain running mostly along the dowel with minimal runout. I then cut the 48" dowel in half to get two 24" arrows.
Out of 100 dowels in the store bin I may walk away with four, which is 8 arrows. The short 24" arrow is strong enough for a 25@28 bow, another reason I like the short arrows. Then they can't be drawn past 24".
These are great for the young shooters.
For the TGMM bow giveaway program I make 26" arrows from 36" dowels bought in bulk. They too get culled thru. Mike's Pup bows can handle a 25" draw. Keeping those little wood arrows straight is tricky, but doable.