Of course, the .17 Remington was the second US Ctg. to break 4,000fps in factory ammo & did it using a 25gr. bullet.
With a 20gr. and handloads, this .17 easily breaks 4,500fps. With a 15gr. Berger(no longer in production) it would break 5,000fps, as used by one fellow in the States on coyotes.