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The German WWI Paris gun still holds the record for a conventional "practical" gun (practical in a limited sense, they achieved the speed by using a set of steadily growing rifling rings to make up for excessive barrel abrasion).
You can achieve much higher velocities with a light gas gun. In it a conventional charge compresses a hydrogen or helium gas to very high pressures, and it's fired by a burst disc releasing the pressure. You can get up to 25,000 ft/s that way.
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I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.
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