The doctrine of double effect (DE) and the doctrine of doing and allowing (DA) are usually interpreted as deontological non-consequentialist doctrines. In this essay I elaborate a consequentialist version of DE, Harmful Means DE. It asserts that in some cases, an ordinary deliberator is subject to a preemptive rule which prohibits knowingly causing the death of few as a means for saving many others, because, by following the rule, she is more likely to conform to the commands of prospectivist act-consequentialism. Harmful Means DE yields some of the most attractive results of deontological versions of DE. I then develop a consequentialist morality of unintentional killing—Harmful Phase DA—which resolves an under-explored tension between DA and DE.