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.
Anyone who shoots a sabot bullet has had the problem with loading the next round with a dirty barrel we have all struggled with it.
Between muzzleloader shots I have done some research and testing on my own to find out what works for me for the next shot. I have been using a product called bore butter and when the muzzleloader is just sitting around I leave it caked in the barrel for protection. Have also found that if I lube my sabots with bore butter they really slide nicely down the barrel....