[The Shootist]

Why use a 122? What's wrong with the 4duce?

[edwin hubble]

"Why use a 122? What's wrong with the 4duce?"

The 122mm is half again the projectile size of the 4.2 inch.
the 122mm range is 8.2km vs. a range of 5.4km for the 4.2 inch.

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The 4.2" mortar is 106.68mm in diameter, compared to the 122mm mortar. (a ratio of 1.1436 to 1)

If you compare the relative volumes (taking the cube of the diameters to approximate the mass and volume of the projectile) it is 1.50 to 1.