Army's gun problem

P21

This is an Army problem . But, anybody can solve it. Do it in 5 minutes.
The Army had offered a large price for the design of a rapid fire gun. Soon enough, an inventor came with a gun which when once loaded would fire 60 shots at the rate of a shot a minute. The experts put the gun to test and found that it fired 60 shots an hour. The gun was rejected, as it did not fulfill the promised condition. The inventor protested, but the experts would not relent. Were the experts right?