Well the Fastest I'm aware of is a smooth bore!
Yes, I said a smooth bore, and to be honest its not a sub-caliber so it really doesn't qualify but its a wonder to behold.
It's a 120mm on the M1 Abrams tank. Will punch thru multiple inches of armor at better than 3 miles, and get there in just a couple of seconds. Puts the muzzle velocity in the 5,000 fps plus range.
I also here that there are attempts at 10,000 fps in the works, but what do I know.
Oh yes, by the way the bore of the barrel is 120mm the projo is actually 2" in dia. about 24" long with vanes kinda like an arrow. It is the sabot round that the Army uses and the vanes burn off while in flight giving the round a golden low as it goes downrange.
Just for the fun of it
Bulletpusher
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Bulletpusher
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