quick conversion pd. to mm cannons callibers?

Question

do you know some quick conversion between WW2 british units in Pd. /pounder/ and standard /rest of world/ mm calliber?
it is just for a quick comparison i guess 19Pd. gun shall be approx. 90mm bore barrel. thanks a lot.

thanks indeed I know that the pound is qight measure but i guess that a typical gun usually fired a typical ammo and that should have the same caliber. it is not much important i just wanted to have a quick reference. when you say 88mm gun i got it quickly, from the effects to the size of the round. it is much more difficult to me to derive the size from weight of the round, since i am not a tanker nor artillery crew.

Answer 1

Sorry, but I'm not sure there is a direct conversion.

The older British system measured the weight of the projectile -- so a 9-pounder would have fired a 9-pound projectile. That same tube could have fired a 10-pound, or a 5-pound, or whatever shell.

To add insult to injury, the Brits seemed to mix their systems -- if you check out the reference below, they list artillery as "X-pounders" in some cases, and by inches in others!

For example, the Q.F. 25-pr Gun Mk 2 has a bore of 3.45 inches (87.6 mm). The Q.F. 18-pr Gun Mks 4A and 4B had a bore of 3.3 inches (83.8 mm). The Ordnance, B.L. 4.5-inch Gun Mk 2 (4.5 inches = 114.3 mm) fired a 55 pound HE shell, and was a replacement for the older 60-pounder, which was a 5-inch gun, which fired a shell weighing 56 pounds!!! What?

It's all rather confusing, really.

Answer 2

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