I have several deer bones in my garage waiting to use. I am using the beetle method of tissue removal. (I have no idea if they will work out or not, but they didn't cost anything, so I figured it'd be worth a shot)

I don't think dug up bones will work so well. IIRC from digging up cows as a kid (when I was a 10 year old amateur archaeologist) they get pretty spongy after being buried for awhile. You'd probably be better to start with fresh bones and find a good way to process them from the start.