In Gurps, how powerful do you need to fight a tank?

[Anthony]

If you want to just slug it out with a tank, going through frontal armor and absorbing hits from the main gun, requires being able to punch through 1500 DR and then rip through around 200 hit points. It also requires being able to take a hit that's on the order of 6d*30(3) piercing. This is solidly C-scale.

If you're willing to dodge the main gun and go after weak points, it's a lot easier -- you want damage in the hundreds, which is D-scale.

I-scale characters might be able to kill a tank, but they'll need to be creative.