I own a .303 No.1 Mk.III Enfield. Fabulous weapon. I collect and shoot classic infantry rifles, incl. '06 Springfield, G98 Mauser, Mosin-Nagant, etc.
I agree with a comment regarding WW1-era weapons: The Germans brought a target rifle (the G98), the Americans brought a sporting rifle (the '06 Springfield) but the British brought a battle rifle (the .303 Enfield). In the hands of a skilled shooter, the fastest-action bolt gun. Ever.
And no, your crappy little plastic .22 AR is not a battle rifle. Unreliable, under-powered lead hoses. They suck. The Marines say they suck. The 11 Bravos say they suck. The SEALs say they suck. No amount of wishful thinking can change the physics of a glorified .22 versus a 7.62, 7.92, .30-06, or .303 round. AR's just suck. They were foisted on us by a rigged Army ordnance competition, and the rest is sad AR-15/M-16 history. They had to pry the M-14 away from the Marines.