Would smaller diameter mean any of that? We have high velocity 40 mm grenades and 30/35 mm bullets, I don't see what difference 30 mm would make.
3 times more velocity makes flight trajectory accurate, doubles the range, increase the rate of fire while keeping compactness.
35mm Korkut/Göker/ Gökdeniz is huge but has 3.5 km effektiv range and 2x550rpm.
Rheinmetalls 30x173mm has 2.5km effective range and 1000rpm though We haven't got it yet.
But we have 30x113mm solution at hands . İt could have 2/2.5km eff range and 1500rpm. 30mm ATOM would be absolutely Better than 40mm ATOM grenades while keeping compactness.
I would like to recommend you to listen how dual barrel DEFA gun (uncle of VENOM) bursts.
Very light and compact cannon with optimal range .
DEFA 553 30mm Cannon Gun Run
The Argentine Air Force conducts a practice air strike and some gun runs using a DEFA 553 30mm cannon.
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