3/8", straight grain dowels(ramin, poplar, oak, birch) can make good arrows. You may have to sand them to reduce the spine or add length and heavier weight up front. The standard spined arrows are are measured at 28" long with a 125gr point. For each inch over 28" you can reduce the effective spine by 5# per inch and for each 15gr(I think) of tip weight over 125gr you can subtract 5# of spine weight. So, for this same shaft that spines to 75#, cut to 30"(+2"x5#= 65#spine) and if you install a point that weighs 155gr(30gr over 125gr =35# spine). This will give you an arrow that is actually spined at 65# that shoots like a 35# spined arrow.
I draw 26" on a good day but cut my arrows to 30". I think a longer arrow has a easier time getting around the bow.