After some thought, I'd go ahead and just use the equivalent of Small Arms Pen 2 for trebuchets. The projectile's not incredibly fast, but it's heavy and dropping from the sky in a parabolic arc like a mortar shell.
I'm also tempted to allow shorter ranges (though that can be done by lightening the counterweight), since I've seen notes about adjusting the length of the sling that holds the projectile to change the arc and thus the range.
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Writer at The Vespers War - World War I equipment for v2.2
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