inhuntr: Your problem is well known and well understood. Steel is less dense. As a result, steel penetrates game birds less effectively. There are several solutions: (1) shoot your game birds at closer range, giving up on longer shots; (2) use steel shot of larger size (a trade off: the larger shot will penetrate more readily than smaller shot, but there are fewer shot pellets in the pattern, probably also requires you to limit the range of your shots); (3) use high density shot loads such as Hevi-shot, Remington HD, Winchester's high density load, Kent's Tungsten Matrix load. Hevi-shot is expensive, however, and the others are even more expensive, I think.

I vote for shotgun shells shooting non-toxic shot that has density twice that of lead at velocities of 1650 fps that has negligible recoil that is soft enough to use in classic shotgun barrels that patterns well and costs only $0.05/shell. Now I will wake up and return to reality.