That's black birch? I have a tree growing out back that looks just like that, but i thought it was wild cherry. There was one growing up next to it about 2-inches in diameter that died and I made a hiking stick with it too. I thought the birch that looks like that had a sort of licorice smell to it?
That actually resembles some of mine as I have recently taken to having a half-fork/half-handle size ratio for mine. As I shoot fork-supported with my "sweet spot" about one inch below the fork tips this allows me a much large fork to shoot stones and such through while at the same time keeping the slingshot exactly the same size. It sounds very basic but this sort of fork as he has pictured will allow a shooter to have a pocket-fittable slingshot that has a full-size fork. No more struggling with mini-slingshots for me.
Looks like a good one HG and hope it works out good for you.
I could be wrong DH I'm no expert. We do have a stand of birch near where - picked it up and the bark was real similar, there wasn't much smell when I was stripping it but it had been down the better part of a year and was very dry. What ever it is I like it very hard with a nice weight.