The new Battlefield 1 game features a full auto 1907 with an extended mag as one of the possible weapons. I know they were used by the French, originally for air to air, if I remember correctly.
I had to remind my 15 year old son that we had one, after he started playing it.
I couldn't help him out on the Luger rifle.
For the 1910, I've been resizing .41 caliber bullets down to the correct .406, using a push through die. For the 1907, I've been able to find .351 bullets so far, but I think I'll eventually get a resizing die for it as well and resize .357 bullets. Should be cheaper, and solve the potential scarcity.
The biggest issue I've had with either of them is brass. While they are occasionally made, they are usually out of stock. I purchased Jamison brass for the .351, and I see they are currently in stock again at Midway. I did end up sending about half of them back, because they rims were out of spec and wouldn't fit in the shell holder. To Midway's credit, they handled it well. I should probably order some more, since they're in stock.
Load data is scarce as well, but with the internet, not that much of a challenge. Just don't expect to find it in any recent reloading books.
I think I'd like to eventually add a 1903 and a 1905.