Really? I find loading magazines like the rugers, more tedious. I love loading tubes. Just line it up and drop it. No pushing down while sliding the shell forward. Then again, I have a place to sit, either at the truck, bench, or out in the woods on a log or stump. I even love the sound as it drops, and slides down the tube.
Seems just as easy to load them into the tube as it does load them into an arrow shaft and then into the tube.
I would call mid-way and see what they say or just call Henry. They are great and would likely know if one exists.