Out of curiosity what kind of numbers did you give shotguns? It should be pointed out that a 12 gauge shotgun is arguably the most effective one-shot manstopper on the face of the planet, at least without body armor, so your numbers may actually be correct...
First thing I did was change the number of projectiles. http://www.remington.com/products/ammunition/shotshells/buckshot/express-buckshot.aspx.
Each .33" 12ga 00 pellet has 210 ft-lb of muzzle energy and a TKO of 3.
Each .25" 20ga #3 pellet has 73.5 ft-lb of muzzle energy and a TKO of ~0.
Using my proprietary SCIENTIFIC! formula (patent pending :celebration: ), I have each 12ga pellet at 12.7 DAM and each 20ga pellet at 8.3 DAM. (disclaimer: I'm pretty sure I borked something in the data entry on one or the other, as the 20ga is too close to the 12ga. I haven't had time to recheck the formulae, which are about the length of
War and Peace. I'll get to it)
The 12ga DAM (max skill, all pellets hit) with a 30" barrrel is pretty good at 114, but the 20 ga is too high at 149. Like I said, I think I fat fingered a key somewhere. Now for each weapon, I take barrel length and other factors into account for the exact DAM each weapon has. The weapons perform pretty good, modeled with appropriate spread numbers. You don't do a lot of damage at long ranges, as you get less pellets to hit, but up close, they destroy. The 20ga a little too much. Guess I know what I'm doing tonight.
-Gunny out.