not sure if that's the correct spelling for that gun but on my first character I unlocked the case myself and when I got it, I had ammo for it. on my new character, I had Dogmeat get it for me yet have no ammo for it. is it because Dogmeat got it for me or the fact that I just haven't found any ammo for it?
edit: don't bother responding. i checked the cryolator page and it said Dogmeat will have the ammo if he got it for the player. geez do I feel stupid now.