All the manufactures of Black Powder Handguns(Pistols and Percussion Revolvers, with exception to the (Ruger Old Army)
Are worried about liability that some knucklehead may use smokeless powder in them and cause a legal problem so they put the many warnings out there. Your Optima Pistol is a powerful strong work house that will bring home the Big game, especially with my Universal Bullets see video bellow with noted author Hovey Smith testing it.
http://youtu.be/dTnG1x-orSk