Continued development was needed to turn it into a weapon suitable for production, which was completed in October 1933.
One attempt to solve this problem used zinc shell cases that burned up when fired.
This proved to leave heavy zinc deposits in the barrel, and had to be abandoned.
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In the summer of 1930 experiments were made with a new test gun that did away with controlled feed and instead flicked the spent casing out the rear whereafter a second mechanism reloaded the gun by "throwing" a fresh round from the magazine into the open breech.
This seemed to be the solution they needed, improving firing rates to an acceptable level, and the work on a prototype commenced soon after.Most forces referred to it as the "Bofors 40 mm L/60", although the barrel was actually 56.25 calibres in length, not the 60 calibres that the name implies.The rate of fire was normally about 120 rounds per minute (2.0 rounds per second), which improved slightly when the barrels were closer to the horizontal as gravity assisted the feeding from the top-mounted magazine.During this period Krupp purchased a one-third share of Bofors.Krupp engineers started the process of updating the Bofors factories to use modern equipment and metallurgy, but the 40 mm project was kept secret.In the wake of that, HP made the decision to revive the line for a limited time.