Arizona Muzzle Loading Association are hosting the above at Ben Avery Shooting Facility, Phoenix, Arizona on 5-8 March 2019 (the first date being practice). There are classes for Black Powder Cartridge Rifle (iron and scope sights), Vintage Sniper Rifle and Black Powder Muzzle Loading Rifle. See the registration page at www.azmuzzleloading.com for a link to the registration form.
Note that this event immediately follows the United States International Muzzle Loading Team nationals, that will be at Ben Avery 2-4 March. This event also includes classes for muzzle loader, cartridge and vintage sniper rifle.