What higher caliber could a pom-pom-style system reach?
Short answerRoughly 57-60 mm might be the upper limit, but 40 mm remains the practical sweet spot.
NotesThe mechanism's possible scaling limit is separate from the caliber at which its overall design remains most effective. A pom-pom-style arrangement might plausibly grow to roughly 57 or 60 millimetres. Feasibility at that size does not mean the enlarged weapon would preserve every advantage of the original. The familiar 40 mm caliber remains the practical sweet spot for the mechanism's shape, handling, and anti-aircraft purpose.