Halve Cartouwen

I was curious to see if I might have been able to find a description of 16th and 17th Century guns described as cartouwen and halve cartouwen. I was reading a page that described a cartouwen as firing a 52 pound shot and as having a 8 inch bore. Of course, we don't know the actual weight and inch being used. The Dutch used halve cartouwen, in the First Anglo-Dutch War, firing 24 pound shot. They were usually made of bronze. I have a page that gives the weight of a bronze 24pdr gun as 4806 pounds. They varied, of course. Chambered guns would be lighter.