The 303 British has probable killed more game world wide than any other cartridge maybe rivaled only by the 30-06 and 7x57 mauser. It is however certainly not in the class with the 270. I have a couple 303 rifles. One made by Long Branch in Canada. The other made in America by Eddystone. The latter has a stronger action or at least the brass will last three or four times as many reloadings as the ones fired in the Bristh. They certainly are a very adequate deer cartridge. BUT IT AIN'T A 270.