Looking at this, and at the course of fire posted on the Puuloa site, I'm struck by one thing in particular: Rapid fire, 10 shots in 60/70 seconds, starting from standing and assuming sitting/prone position. Shooting a scoped bolt action with a fixed magazine (like a m1903a4, for example), that seems darned close to impossible. How do you manage the reload?
Nope, very possible and many do it. It just takes some practice.

Actually the older timed matches where 50/60 seconds for semi autos and 60/70 where when bolt guns where being used. They eventually standardized with 60/70 second rules.
Scoped rifles are relegated to F-class shooting, all done prone and slow fire.
The m1903a4 would be loaded via the stripper clip. Other types of rifles with detachable magazines or garand are usually loaded with two rounds first,on an empty chamber, get into position, rack a round, shot, then loaded with a mag with 8 rounds to complete the stage.
Timing and cadence ensure all rounds are well aimed shots, not spray and pray action, and guys that are well practiced can 'clean' the targets.
Not me though...
Garand
AR
Match at Puuloa