RE: British 303
A #4 Lee Enfield was my first big game rifle. The 180 grain Sierra spitzer flat base was an accurate bullet out of the old 2 groove barrel. Full throttle loads were going about 2400 with IMR 4320 - about the same power class as the 30/40 Krag. Shot my first elk with this gun in October of 1975. It will do the job out to about 250 yards.