On Saturday, I'm going to take a friend and his 15 year old son to some land I have and show them how much fun they can have shooting. I'm bringing my M&P 15-22 MOE (aka the Assault Squirrel Rifle), a Sig AR-15, some handguns, and my Remington 870 Express Magnum Turkey Murder Machine. I'll have some tin cans, and those rubber balls and squares they can shoot down the road. But I'm thinking the big finale should be watching a watermelon or a cantaloupe explode like the Death Star. So what do I put in my 12GA to make it happen?