lodgepole pine or shore pine, has been used very successfully. its commonly known as "Chundoo".
it has a very high resin content and plays heck with sanders and sanding belts, so if you plan to put a long tail taper on them, the paper will gum up quick- i have tried it
but they have a beautiful polish and sheen to them, due to the resin, and are a tough shaft, i would say about the same mass as POC.
Personally, i would say, tougher than POC, but thats subjective i guess
like POC, they come from a smaller tree, ( unlike the Sitka spruce and the Douglas fir - that are typically larger trees)and so there is less clear wood on the log, so the arrows grain can be a bit more squiggly, but to no detriment to the shaft. they are tough!!
they do better with solvent-based stains, than water-based, once again due to the high resin content
the name chundoo is from the Carrier people up here in BC. It's their name for the lodgepole pine tree.
it came about when a good friend of mine - Sam Moore was making LP pine shafts many many years ago, and selling them, and someone started up in competition but their quality was way inferior , but they produced volumes and flooded the market, very quickly the pine was developing a bad name, so he changed his brand name to "chundoo" and the rest is history- so they say!!