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James K · July 9, 2013, 08:18 PM

The main advantage of the cannon was not the projectile diameter, but that what was wanted was an explosive projectile, and 20mm was the smallest caliber that could hold an effective amount of explosive.

Jim

July 9, 2013, 08:18 PM	#9
James K Member In Memoriam Join Date: March 17, 1999 Posts: 24,383	The main advantage of the cannon was not the projectile diameter, but that what was wanted was an explosive projectile, and 20mm was the smallest caliber that could hold an effective amount of explosive. Jim