I've worked with 7265 Plus X BW reversal, 7266 Tri X BW Reversal and 7285 Color Reversal in school, and that's what I'll be testing with the K3. In addition I got a roll of Vision 2 7218 Color Negative, so I'm really excited about testing that.
So far, my dummy film has been running fine and is no longer chewing back into the sprocket....I have loaded it almost a dozen times with no foul ups, and that's with the loop formers still attached, so I think it's safe to say the manual loading method has saved the day.
Holograms? Tell me more!