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It's not a macho thing, we're curious as to how it would pattern.
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It's almost impossible to shoot both barrels exactly at the same time. One shot charge will always come out of the barrel before the other one.
The shot that comes out last will hit higher than the one that comes out first. That's because the gun's barrels jump up while the shot is accelerating down the barrels.
What you will see on the patterning board, (you need a big one to see the second pattern) is one pattern above the other, the distance apart will depend on how many milliseconds of time the second barrel was delayed.
The
momentum of the gun, not the energy will be doubled.
In order to double the momentum, the velocity of the gun will be 2X and doubling a masse's velocity quadruples its energy.