I'm with you on this Darren, it's an incredible feat -- 56 shots in 60 seconds! If loading the magazine three or four times (6-8 chargers) took at least 10-12 seconds out of the minute, then the entire cycle of ramming the bolt, aiming, firing the shot, and extracting the cartridge had to happen in 3/4ths of second. This man had super-human reflexes. There are people in the sport that can do this -- saw it on the History Channel recently -- sharpshooter hit two balloons spaced several yards apart at a short distance with a six-shooter. Everyone heard only 1 shot, but in slow motion he drew, cocked, aimed, fired, cocked, aimed and fired TWO shots on target in 1 second. Amazing.
The article didn't say which rifle was used. With the rear sight located amidships on the barrel of a No.1, I'd think there be a harder time getting on target than with a P-14 with a aft-mounted rear sight. But perhaps I'm off target with this thinking -- Maybe the Sgt. Major was very accurate at point-and-shoot (something I couldn't even come close to doing at those ranges!)
I might also polish and wax the rails of the charger clips to make sure the cartridges slide easily (some charger clips are pretty ornery).
Perhaps a special 15 or 20 round mag would carve off a couple of seconds too (the story didn't say if the gun had any modifiactions, which are normal on exhibition guns).