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Probaley would but it would smash a foot just as effectively as a steel one . I've got a couple of the orange 4 pounders ,18" handle or so .They make a pretty good thump .

Well yeah and those are most likely those giant azz Douglas firs .

It's just like the discussion of ropes .I suppose it's just what a person is more comfortable with .Big timber fellers certainly would be more attuned to using a jack than the average cutter .

Most of the time they jack those giant trees in the PNW .I don't know if it's worth the effort on most eastern hardwoods .Maybe in some cases .??? We were just discussing that on another thread ,ropes and wedges ;)

It would take either a 400 pound giant or a gorilla to pop the seals out of a good 20 ton .You can take a twenty ton and with no handle at all raise a pick up truck .Takes forever though . FWIW some of my smaller 5 and 8 ton jacks have relief valves and you can't over load them or so they say...

A jack is just a little cylinder that pumps into a larger cylinder with a couple of ball check valves . How most get blown out is if the load gets so much instead of using the standard jack handle they either stick a cheater pipe on it or the end of a 6 foot spud bar .

Most will blow the seals but some have reliefs built into them .Depends on the jack .I've got a 20 ton about like that green one .Garage sale 20 bucks .