RE: British 303
.303 british....been using that caliber rifle for as long as i can remember....some of the bear hunters that lose their guns and luggage in the airlines have used my gun also....have absolutely no complaints...ask the three elk,2 moose an all the whitetail i killed last season..lol...i have a lee enfield mark3....monte carlo stocks topped with a 3x9x50 scope and a harris bipod....great accuracy...prefer 150 grain for all my hunting...so by all means go with the .303