My favorite "plinking" load:

Starline .44 magnum brass
Fed Lg Pistol primer
8 grains of HP-38
240 grain flat nose Berry's plated bullet.
Medium crimp

It's a mild magnum, accurate, and very clean shooting. The brass drops right out of the cylinder and is clean as it was when you slid them in. Just a nice fun load that wont beat up your hands, or your gun.