The uncertain progress of cannon-calibre Gauss guns

Is anyone developing a cannon-calibre Gauss rifle?

Development is reported, but the closest example recalled still needs a small crew or vehicle mounting and its readiness is uncertain.

Cannon-calibre Gauss-gun work is said to be under way, but the answer relies on limited information about its progress. The most promising example recalled would need a two- or three-person team to move it, or a vehicle mounting. The lack of a widely circulated demonstration leaves its readiness uncertain, so the discussion makes no firm claim that a practical portable weapon is available.