Caliber for cannon barrels indicates the length of the barrel.How is it same mm but different caliber?
L44: 120mm x 44=5.28 meters (5280 mm)
L55: 120mm x 55=6.6 meters (6600 mm)
155mm 52cal artillery cannon: 155mm x 52=8.06 meters (8060 mm)
Edit: Just a side note. The M256 cannons used in the Abrams tanks are not exactly the L44. They are longer by a small margin. 208.7 in (5,301 mm)
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