I don't call a MV of 2,720fps and 2465 ft lbs of energy
Would that be with a 150 gr bullet?
If so what brand of ammo?
Near as I can tell the British never used bullets lighter than the 174 gr MkVII, though theres no telling what various sporting ammo manufacturers have tried.
The MkVII bullet was actually based on a 150 gr hunting bullet, the "Velopex", that used a light weight nose plug. Velocity of that cartridge was around 2600 FPS.
For some time they considered using a 150 gr spire point at 2600 FPS, but the available propellents of the day were better suited to the 174- 225 gr bullets.