[outofsalt]

"But 600 rounds in 60 seconds?
Sort of like saying a car that can reach 60 mph in 5 seconds will get to 720 mph in a minute."

Your post is exactly correct, but there was a "C type" drum that held 100 rounds.

[Swordmaker]

Your post is exactly correct, but there was a "C type" drum that held 100 rounds.

Try carrying that around with you. It’s not light with 100 rounds of .45 ACP loaded plus the weight of the Thompson, which was never a light weight gun at 11 pounds without magazine. It’s one advantage was that it helped control the gun’s tendency to climb while shooting due to recoil if firing full auto. Bursts were better controlled.