Favourite gun calibres and their historical associations

What are the panel's favourite gun calibres, from handguns to naval artillery, and why?

Preferences differ by role. Historical reasons include the 75 mm and 76 mm association with quick-firing field artillery and enthusiasm for 11-inch German naval and railway guns.

Personal calibre preferences vary with the weapon's role. Small-arms choices include 9 mm, 5.56 mm, .45 ACP, and the 7.62 mm or .308 size range. The .50 BMG receives a separate vote of affection. A preference for 75 mm and 76 mm field guns rests on their association with the introduction of quick-firing artillery. An 11-inch preference connects German battleships and battlecruisers with the K5 railway gun. Foxo's choices include 30 mm autocannons, the OTO Melara 76 mm, and 105 mm and 155 mm artillery. Naval favourites range across 5-inch, 6-inch, 14-inch, and 16-inch weapons, with a proposed 17-inch naval gun attracting interest as an unusual design choice.