The newest Airgun Target.  The Power Tower has 8 targets that you can shoot.  The bottom target is big and easy and the top target is small and harder. 
The Power Tower stands on a sturdy stand, but can be anchored more firmly through the holes in the foot with tent pegs, for example.  The goals are made of 3mm thick steel and can take a beating.
 
This target is suitable for air rifles from 40 Joule.  For short distances you can use a slightly lighter rifle.
 
Shoot the 8 targets from easy to hard.  The targets flip to the other side after which you can shoot the targets back and so on.