Good lord ctom! Haven't you ever taken a Hunter Safety Course?
Chuck, you may want to check your hunting regulations there in MN. I know here in PA a muzzleloader is not considered "loaded" if the perc. cap or primer is removed or the flash pan on a flintlock is empty. A cap from a valve stem fits nicely over the nipple to prevent and incidental spark from entering the charge. Or you can pull the bullet/ball with a bullet puller and then scrape the powder out with a breech scraping tool. Both of these fit on the end of your ramrod. (If you plan on pulling your ball, make sure you drill a small hole on your brass ramrod end and pin it to the ramrod using a small brad and peening it over and filing it so it doesn't pull off the end of the ramrod)
But the absolute quickest and safest way to unload is to shoot it into a proper backstop (a dirt bank, stump or something that will safely stop the bullet.
One other option is buying a CO2 unloader. With this thing you would need to remove the nipple, install the correct attachment, and send a "charge" of compressed CO2 into the breech to blow out the charge. I've done this with my air compressor also. But you still have to clean it so you might as well practice by aiming and shooting at a leaf on a dirt bank for practice.