I am a leathercraftsman in southern Delaware and have done a lot of holsters (cowboy, conceal, pommel, etc.). I have attempted making a cowboy mounted shooting holster and while the holster looks great, there is 1 structural fault in it. I have since learned to flare the top of it with rawhide so that the opening is large enough for easy drop-in of the gun. With the holster that I made, I can hold the holster upside down with the gun in the holster and the gun stays in place nicely. The problem is...when the rider is on the horse, going through the course, the gun popped out of the holster. Is there a certain lining that I should be using that would "grip" the gun better? Any insight would be greatly appreciated. I lined the holster with smooth leather.