Like some help designing something

[Tanker100]

So I'm trying to come up with the a damage for 17 pounder cannon, I've found damage for 6lb cannon at 8d6. Any suggestions?

[Durzan]

Find the ratio between a 6 in canon and a 17 in canon. Use the rule of proportions to determine the approximate damage the 17 in canon would deal.

[Tanker100]

Thank you for that

[digiman619]

Just keep n mind that there's an upper limit; don't think that a 100 lb one would be the be-all-end-all.

[TheYell]

6 pound ball at speed X doing 8d6 of damage is 1.3 d6 per pound.

https://en.wikipedia.org/wiki/Field_artillery_in_the_American_Civil_War

The "24 pound gun" on that list fired a ball that weighed 18 pounds and flew about 2/3 as fast as a 6 pounder.

1.3 x .66 = .858

so a 17 pound ball would do 17 x .858 d6 or 14d6.