When I was much younger, we used to shoot skeet at night with 12 ga 18" barrels. Great fun, BIG flames out the muzzle, big noise.
For even more fun, try skeet at night with a 10 ga muzzle-loader. BIG flames, BIG boom,big cloud of smoke. Made doubles very difficult.
Unfortunately, most ranges around me will no longer let you shoot anything with a barrel less than 24". Safety concerns I guess.