For what it's worth
here is a side-by-side comparison of modern light canon rounds. The 25x137mm (two examples, one green-cased and the other gray cased with a white tip) is fired from the M242 and the 30x173mm (orange tip) is fired from the navalized version of the GAU-8 used in the Goalkeeper CIWS.
The point is the GAU-8 round was compared to a glass 16oz Coke bottle and was and largely still is one of the largest 30mm rounds made. Comparing it to the 25mm round for the M242 Bushmaster is like comparing apples and oranges.
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The user formerly known as ciaran_skye.
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