Writing up metallurgy for a campaign

[Polydamas]

Originally Posted by Fnugus

Sure. The big question is, in relation to GURPS game balance compared to weapon damage output, how does it scale? Does half the RHA of steel means half the DR?

As I said, armour equivalent to 1” of RHA has DR 70. Armour equivalent to twice or half that thickness has twice or half the DR. Projectile damage scales roughly with the square root of kinetic energy divided by diameter, and the DR of a flat plate scales roughly with thickness. (It seems that things get more complicated at very high velocities and high energies, but this works well enough for bullets and arrows).