10-15 to fight I'd duel wield machetes in full riot gear save ammo after all this is the zombie apocalypse save your ammo. Any more then that I'd go with a shogun full barrel for range. If there were a horde of zombie like over 100 of them I'd go with explosive hand grenades or better yet dynamite or nitroglycerin. Shrapnel might not be enough concussive power is better to blow them apart.... I really like zombie mythos
