Traveling muzzleloader

Howdy,

I have flown almost everywhere you can with a center fire rifle. I am about to fly for the first time with a muzzleloader. I heard somewhere that flying with black-powder is not allowed. Is this true? What kind of regulations do I need to be prepared for and compliant with?

Much Thanks,

Ben

Have someone buy some on the landing side. Ground shipping would take too long and be very expensive.