Last year we made some custom pouches for a customer from some thin cow leather he sent us. My wife sewed it on her 319K with regular needles and thread. We did find out about what happens with the stitching too close. Not good at all.
We have that machine, 5 66s, a 15 clone and a couple others with nice long stitches and some pretty stout motors.
That said, we've never done anything with buck skin.
Would a walking foot attachment work? We don't have an industrial machine as much as we'd like to have one.
Joe