OK, will pinch some from Norma (for now).

.222 Remington
55 gr projectile at a muzzle velocity of 3000 fps

.223 Remington
55 gr projectile at a muzzle velocity of 3100 fps

.22-250 Remington
55 gr projectile at a muzzle velocity of 3600 fps

.220 Swift
55 gr projectile at a muzzle velocity of 3800 fps

5.6x52R / .22 Savage Hi-Power
71 gr projectile at a muzzle velocity of 2800 fps

6x70 mm Rimmed
90 gr projectile at a muzzle velocity of 2400 fps

.243 Winchester
100 gr projectile at a muzzle velocity of 2900 fps

While a slower velocity than many of the rounds shown above, it is very similar to the 5.6x52R and if a light 6mm bullet was used, eg 70 gr would probably have a similar velocity IMO. However the 90 gr bullet would be more effective on the lighter medium game animals.