dmg wise it should be shotties since the majority of the group outperforms the raygun (expect the good ol' sawed off, but shit is good for farming points on one window. there maybe saiga but the dps is clearly shows to gap).

if there was an option for Kaboom C9000, Mr Wick, both variants of the Magnum and PTRS-41 and 98k Beheaded. i would choose that one. These guns just shred if u pop the zombies head off constantly. i also should mention that PTRS (by only the Trench shottie) and Magnum gets out dmg'd by every shottie headshot expection of sawed off . but it is still a solid gun for a side arm on high rounds with fast movement and high dmg. (not to mention that kar98k gets outperformed by magnum later rounds unpap'd)