Some Rotterdam guns from 1615

I have not seen that many cases where there are the weights of guns listed, but I recently received pages that had gun weights for Rotterdam guns from 1615:

24pdr 4473 pounds
24pdr 4616 pounds
12pdr 3180 pounds
12pdr 3131 pounds
 8pdr 2070 pounds  bronze
 8pdr 2060 pounds  bronze
 6pdr 2186 pounds
 6pdr 1584 pounds
 5pdr 1600 pounds
24pdr 2480 pounds Spanish chambered piece
18pdr 1400 pounds chambered piece
 4pdr 1400 pounds bronze
 3pdr 1000 pounds bronze