I think this discussion about reloading these cartridges is all academic. If you are going to invest in this proprietary rifle/powder system, you are going to buy the powder cartridges. Unless you pick up one of these rifles on the cheap, you probably won't find yourself trying to reload the cartridges.
For me the question is, "what is the true advantage of this system?" How much quicker can it be reloaded compared to a traditional or inline muzzleloader? Fast enough to get a second shot at a running deer? I doubt it. I can reload quick enough to get a second shot at a standing/walking deer. I don't need a gimmick to make that happen.