An unsafe practice when using a muzzleloader is__________.

Pouring powder directly from a horn, flask, or other large container is an unsafe practice when using a muzzleloader because it increases the risk of an uncontrolled ignition or spill, which can lead to accidental discharge or explosion. Using large containers can result in the user inadvertently pouring too much powder into the muzzleloader, which is dangerous and could compromise the rifle's safety mechanisms. Moreover, it’s essential to measure powder carefully to ensure consistent and safe firing.

While loading inside a vehicle and having multiple people nearby can create safety issues, the act of pouring powder directly from large containers poses an immediate risk of mishandling the powder and thus is considered particularly unsafe. Keeping the muzzle pointed at the ground is a fundamental safety practice, as it helps prevent accidental injury.