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If you look at old Jupiter videos Luke/OoD has one where he loads a couple rival rounds in a mag, then a mega dart, then rival, then mega, then a final rival and then fires the whole thing. The only issue was that mega was slightly smaller so wouldn't catch in the mags and would just pop out (so you always had to have at least one rival round on top of the mag to start)
Personally I dont think its the best at ingame top offs. As i mess around with pulling down the follower, opening the door and being careful to not bump the darts that might be in there... It just makes me wish it was just a mag.