Any old powder I have that I want to dispose of gets put in a pile in the driveway and set alight. Bullets are recycled, and brass is too unless it's garbage, then it actually goes in the garbage.
The Gevarm usually takes care of any .22 misfires, and if they don't go off in the Gevarm they really are duds. Same procedure as above; work the bullet loose with pliers, burn the powder, pitch the rest.