In reply to:

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The guy with the double starts with two cartridges between the fingers of the left hand, bullets pointing towards the ground. On firing the second shot he works the lever while the rifle is rising in recoil, the action breaks assisted by the recoil and dumps the cases. Since it was a heavy with plenty of recoil and he is not trying to hold it down, the barrels are pointing up steeply enough for the cases to drop out with or without ejectors.

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The above might be an ok way to handle a double when shooting paper targets but don't ever get the idea that it is a good way to reload a double if you're hunting dangerous game.
There are MANY flaws with this system if it is used when hunting big game!
In a controlled situation like range shooting there are a lot less variables than in feild shooting situations.

Also, before I would take much notice of a bolt versus double 4 shot race, I'd want to know the actual times taken.
Two guys can run against each other in a 100 yard sprint and one will most likely beat the other, but this does not mean that the race was run at a time that woud qualify them for the olimpics!