this is a Canadian forum, of course the .303 is gonna win!! you guys should read this months American Rifleman.a very interesting article about a WW1 sniper rifle. it was Holland & Holland single barrel break open, chambered in .303 British and topped with a German scope( supplied by original customer, who was unable to pick it up, for obvious reasons) i t was given to the Irish Gaurds, and over the course of 2 days was used by a Drill Sargeant, with no special training, to kill 3 Germans and wound 4 others, at ranges up to and including 800 yards.and they say the .303 has no reach!