Rampage stacks which means you can run more damage together and you can get it to continue every time you get a kill and reload speed does not dictate it's effectiveness
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In PvP, kill clip. PvE, rampage. On Nightshade, kill clip changes it to a two burst kill, rampage needs three stacks to two burst. The buff rampage does is reduced in PvP, otherwise, rampage would be better.