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Custom pump

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Available in up to .25 cal. Pumps to 3000psi. I would say yes it’s possible for a person to build a powerful multi pump rifle.
 
Bob Stoerne built what he calls a "Millennium pumper " and documents it on Gateway to Airguns in "Bob and Lloyd's Workshop " if you want to search it out. Very interesting project. He started another, I believe that would make even more power.

I don't think he's interested in producing them and don't know of anyone else who might. Would be quite expensive with all the work involved.

I have an old Sharp Ace that will make 23 or so ft lb in 177 and a bit more in 22 but it's WORK to get that much out of it. My Daystate Sportsman will also make upper 20s ft lb but it's even more difficult to pump. The Seneca Aspen seems to be the best right now.

Bob