I bumped into this old thread while doing some searches, I thought I would add some info to the thread as to my conclusion and what I learned with some of the wood I've worked with since starting this thread:
I ended up using zebra wood a couple years ago and Im happy with the results:
I am going to do a bit more shaping, I've taken enough criticism about the shape of the forend that Im going to make it a bit straighter, and I think Im gonna knock 3/8" length off at the butt and take some off the palm piece, it's a bit too much.
Anyways, here is what I learned:
The zebra wood turned out well, was fairly easy to work with, but you have to be aware of the grain when using a chisel, it really tends to gouge or chunk out material with the long grains, kind of like splitting cedar but its much harder. It's held up to safe dings and hasn't warped, it was also fairly good price wise, I would use it again, but I'm not sure I want two zebra wood stocked rifles.
Cocobolo: I used this for the palm and fore end, it's really hard, but fairly easy to work with, it seems to resist dents well, but the coating on it will tend to flake off where it was knocked, apparently because it is an oily wood, anyways, someone mentioned to give it a wipe down with acetone for a bit to pull the oils out before you coat it, otherwise it shows bangs as much as other woods.
Also, cocobolo is like working with cedar or green treated lumber, you will know when you get a splinter, and it's too heavy, and pricey, strong enough for end caps though.
Purple heart: Recently I did some shelving and countertop with a long purple heart plank I bought:
Purple heart is hard as heck, Im sure it would probably show less marks if I beat it with a hammer then our granite countertop, really, it's hard hard stuff and I honestly don't doubt that it would hold up to beating it with a hammer better then granite! It's also easily the worst wood I've ever worked with, building rifle stocks out of it may be some sort of punishment in hell, it is really that bad, and I will never suggest some build a stock out of it.
It is also heavy, it feels like twice as heavy as walnut, and the splinters are worse then cocobolo, cedar or green treated lumber, I spent many evenings running planks through the planer and quickly learned to wear welding gloves, went through many planer blades and that stuff would barely cut, had marginally more success with 36 grit and a belt sander, stay away from the stuff, and have some appreciation for those who work with it, it also chipped some end pieces kind of easily despite being so hard.
Finally: Box elder (Manitoba maple)

I cut a slab of this burl wood off a tree in the yard to clearance it for a fence and then realized what it was. Probably the prettiest wood I've had my hands on, it was as maple to work with, the only issue I had was that I didn't kiln or cure it long enough, and the butt stock warped a bit. It probably isn't as hard as walnut though not bad, but it is about the same weight or actually a bit lighter. Workability is fine and throw some tru oil on it and it is majestic to hold in your hands. If you can find some cured/dryed flame (or firey ) box elder to work with, it may be too pretty to take out of your safe, and although not as strong or common as maple or walnut, to me it is so much more interesting and fun to work with.
Have a search on the web for flame box elder, some really amazing stuff out there.
Currently I'm looking for more info on Baltic birch laminate, if it's fairly heavy and if there is a lighter alternative, any thoughts or input?
Regards,
Cody C.