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They finally reported a bit more info on the incident in this morning's paper.
It seemed that the two-man firing crew was very experienced in this kind of avalanche control. But somehow or other, both of them managed to forget to reduce the charge in the final round. They thought the round was a dud because they saw no impact.
In fact, they had fired a seven-increment charge (the way the round is packed at the manufacturer) instead of removing two bags of propellant for the proper range.
Result: higher trajectory and longer range than intended. They missed the mountain by shooting over it. The round went 9,000 yards and landed in a guy's back yard, putting shrapnel all over and pretty much wrecking his backyard storage shed.
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