Despite the factory claims, most all of the old English stoppers gave velocities between 1900 and 2100 fps in real life. the factory ballistics came from 28 to 30" bbls.
Original Kynoch loads ran around 2130 fps with 525 gr bullets. That was enough then and I don't see any reason it shouldn't be now and recoil is more pleasant than a 458 Lott. At that velocity I can attest that it puts down big game, like our biggest bears, like you dropped a crane on them.