O.K., I'll bite...
Question #4: I suppose the real answer is that they figured that the lazy blasphemers who use in-line for ML hunting season would want an easy, pre-measured pellet that requires no thought for loading/re-loading.
Oops, is my traditional bias showing through??
P.S. If this message has offended anyone, I'm only marginally sorry.
Moderators, please don't kick me out.