Dry firing is always useful, especially drills in mounting and pointing the gun. Its easy to get the butt caught under your arm when mounting the gun and practice eliminates the problem.
Another good method is to buy some action proving dummies and practice loading the gun. This eliminates fumbling the load or failing to fully insert shells into the magazine, and have them pop back out, jamming the gun.
Note that action proving dummies are not ordinary snap caps. These are made to duplicate the weight and balance of live ammo.
http://www.brownells.com/.aspx/cid=0...h=action_dummy