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Old 11-01-2016, 10:51 AM
Kelevra Kelevra is offline
Join Date: May 2012
Location: Ohio
Posts: 466
The wikipedia article on the M1 Abrams has some pretty interesting reading on damage to various tanks, the causes, and the results.

A 20 mm cannon would not penetrate the side armor. While there have been a huge number of 20 mm cannons through the years, none of them offer that sort of penetration. WWII cannons with specialized ammunition might penetrate 40 mm of armor.