Increasing the barrel length of the 75mm gun, without changing the ammunition, would only yield a small increase in performance.
75mm M2
Barrel length (length of tube): 84in
Muzzle velocity: 1,860fps
Armour Penetration: 60mm at 500 yards/30deg.
British 75mm Mk V
Length of tube 107.8in
MV: 2,030fps
AP: 68mm @500yards/30deg
75mm M3
Length of tube 110.625in
MV: 2,300fps
AP: 70mm @500yds/30deg
6pdr Mk III
Length of tube: 96.2in
MV: 2,800fps
AP: 81mm
6pdr Mk V
Length of tube: 112.2in
MV: 2,965fps
AP: 83mm @500yards/30deg
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