I had a friend that called one in by accident. The cat came in behind him and sat down in the snow about 20' away from him while he was calling coyotes. We didn't know what was going on until we met back up to leave the area and saw the tracks and where he had been sitting. It kind of made our hair stand up on the back of of necks.
I think that the thing with mountain lions is that they are quite curious and will come into a call just to see what is making the noise. While out hunting I have seen them following other hunters and at times have seen where they have followed me down a trail when I hiked out and saw their track on the top of my own.
I had a buddy call a lion out of a mine shaft last year that he filmed.
He's planning to use it in a DVD so I can't give too much away at this time but that lion lived as there was no hunting done during the filming of the DVD. Another buddy called a lion last year, later in the year, with an electronic call in the same area. I suspect it may have been the same lion, not too far from where the mine shaft is.
Neither buddy knows the other and I didn't tell one about the other.
I have a system I use in Whitetail hunting during the rut that seems to work for me. When I make a mock scrape in the area I wish to hunt I will place a couple of 35mm
film canisters (film removed of course) in the scrape after I have cleared out all leaves and other debris. The film canisters are filled with cotton balls and saturated with doe in heat urine. This keeps the urine from soaking in the ground and can be refreshed on each trip if needed. I will also use the tarsal gland of the buck...