Dutch gun analysis

I thought that after having some idea about Dutch gun weights, that I could apply my analysis tool to what I learned. The idea is to look at some basic relationships:

D^3 x L x K = gun weight in pounds

I had time this morning to try my hand at Dutch bronze 36pdr and 24pdr guns:

Material Shot wt Length (Ft)  Length (Cal.)  Gun Wt   K
bronze   36pdr   10ft         18.2           6635 lbs 1.2658
bronze   36pdr    9.5ft       17.3           6282 lbs 1.2608
bronze   24pdr    9.5ft       19.8           4879 lbs 1.2835
bronze   24pdr    8.75ft      18.2           4414 lbs 1.2634
bronze   24pdr    8.25ft      17.2           4171 lbs 1.2633