Meaning 11/32" diameter shafts and such.
The problem lies in the fact that it is hard to get a heavy bolt from most of our hardwoods.....enter Ipe.
Ipe is HEAVY. In fact there have been pieces that have such a high specific gravity, that they SINK in water.
They also make a dandy hunting arrow....and bolt.....
A 15" bolt with a 125 grain head will take down most of our American game, esp. whitetail sized critters, not to mention small game.
Adv. Lumber sells Ipe and you can get a 1x6x4' piece for 30$ or so. That is enough to make 25-27 bolts easily. Yes you have to cut and plane them by hand....but if you are a hunter you cannot beat them!