I loaded up 20 rounds in the snail drum and took the whole shebang (drum, loader and strut) out to the range, but try as I might I could not get the drum's loaded magazine to seat successfully in either of the two Lugers I had with me.
The only thing I can figure is that I didn't ram the drum and magazine together quite hard enough to lock everything together. The tensioned round coming out the top of the mag has to be shifted down a bit, which requires a substantial amount of force, more than I was willing to provide at the range.
When I got home, I unloaded the drum and put about 8 of the rounds back in, and this time was able to make things "click". I guess the real road test will have to wait for my next range date.