K1NG COMMANDO is correct. Bungie had buffed Vex Mythoclast to 323 before The Dark Below's release to make it more powerful. Now with the new expansions, its max has been matched to 365 along with the other weapons.
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my vex still says it can only go to 300 though. that's what confuses me.
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It has also been nerfed with the fusion rifle patch. You can't hit anything over shotgun range any more after the latest patch