Q&A · 2:56:38-2:57:34

The smallest gun caliber fitted with a proximity fuze

The on-air memory check identifies the 3-inch shell as the smallest caliber fitted with a proximity fuze and rejects the 40 mm alternative.

3-inch Guns Anti-Aircraft Guns Naval Gunnery Proximity Fuzes

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Question

What was the smallest shell caliber that could be fitted with a proximity fuze?

Short answer

The 3-inch shell, according to the on-air memory check.

Notes

The on-air answer initially pauses over whether a 40 mm proximity-fuzed shell existed, then settles on the 3-inch projectile as the smallest caliber. The uncertainty remains important because the conclusion comes from a memory check rather than a cited specification.