Won't try to explain it, but my load development does not follow any conventional approach or recommended method. Am usually changing upwards of a dozen, two dozen, even three dozen factors at a time. This is not recommended for anyone else. But experimenting on life-changing processes with three dozen factors on twenty conflicting objectives which produces in excess of 60 billion conceivable combinations is what I do, so I tackle ammunition, shooting, and hunting the same way. Don't know any better. (Don't ask my passengers about the experience when I am flying and decide to experiment.)