Buzz saw on a tractor 3ph pto like this one:
Vermont Woodsman Buzz Saw
Or perhaps more of a bench saw like this one:
Portable bench saw for firewood - large | Agrimetal
Now, if it were straight, it could be pushed togcrether, picked up with a grapple and you just come at it from both ends with a chainsaw/s until you are left with the 70-ish" of the grapple width to cut down on the buzz saw, but this stuff aint straight and there's muchomundo of it to get through. If it's really small diameter then I don't suppose it matters a great deal if the ends aren't cut reasonably square b/c it's not going to be split but other rounds will be and I hate splitting crookedly cut rounds.
Any bright ideas fellas and fellesses? I actually favour the non pto variety of buzz saw at this stage. Sure, it's one more engine to deal with but it's not clocking up hrs on the tractor and can be used independently of said tractor.