That's the operative words.Using expensive wood for coring is silly if there is an equally suitable wood available that costs less. I think that is what the OP was asking about.
Woods are priced MOSTLY by figure and rarity.
Among the best woods in my collection is pernambuco.
Would I use them for cores ? Frkn ey no.
I use another specie that is really close to it.
Straight grain tight maple is among the best choice to knock the weight down of heavy woods. They are not cheap if you buy expensive shaft dowels in the first place. I don't buy them in short lengths. I get plenty of 30" dowels that I look at and can tell they won't make it as 29" shafts.
But, a lot of them are salvageable as 15-18" core dowels.
Another good source of core woods is Rockler.
Oftentimes they will have a sale on their 3/8 and 1/2 thin slabs.
They have rosewoods and maple.
You can pick your boards. Stick a needle on them to check moisture content.
Buy the good ones. Let sit for a while in your shop.
Plain them flat on one side.
Cut them the length of the boards, then flip one over for a cross-ply board.
Glue and clamp.
Band saw them to your thickness liking.
Center them and turn round.
Done and aged right, they make for great dowels.
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