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Things start to get a little hazy around the top end of things. The largest SPORTING rifle caliber may be the .700 Nitro Express, although there was an anti tank rifle that was 20 mm (about .80 caliber) and at least one designed in 30mm (1.20 caliber). Years ago, a gun known as the Paradox (part of the barrel was smoothbore, part was rifled) was measured in Gauges rather than caliber- and they were extremely big. I have seen one custom rifle built as an experiment that was a a TWO gauge black powder rifle- fired a lead ball the size of a billiard ball. However, bigger is not always better. Good question, though.

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Q: What is the biggest rifle caliber?
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