Federal has the right lead free ammo for you. One example is this Ultra-Shok High Density Waterfowl, designed to take those big birds. This variation, in 12 gauge, has a 3-1/2" shell loaded with 1-5/8 Oz of #4 lead free shot which it fires at 1450 fps.
Devastating is a word that comes to mind when hunters shoot our Ultra-Shok High Density shot. Designed specifically for heavy shot payloads and blistering velocity, this top quality waterfowl load is just what you need for tough shots on your quarry.
Price is per 100 round case.