These here are the same shotgun model, but each with different type of shells. Birdshot(green) 12 pellets a burst. Has a muzzle velocity of 1200 mph (all of them have the same MV) and deal 100 damage with each pellet. Has a spread of 2. and has a ROF of 5 shots per second (same for all)

Buckshot(yellow) 6 pellets every burst each doing 250 damage. Has a spread of 1.3

Slugs(red) 1 slug per shot doing 500 damage. Has a spread of 0.2 (an un-modded gun has 1) They don't look the best but you can take the example body off and make your own if you wanted to. To move it in the editor it grab it it by the structural panel. Pitch/roll to control them here. And uhh... Enjoy.