User blog comment:CraeSrus/Dps Calculation Formulas – A Work in Progress/@comment-25862085-20150210010226/@comment-25862085-20150210212216

I think it stacks for every shot, though I may be wrong. Now for shotgun pellets, thats harder to explain, I edited my comment for it as the equation of one pellet of a shotgun, for all pellets, then leave out the division and solve it like that or multiply the DoT by the number of pellets, I'm not too sure though.