Lead is ALREADY banned for targets in some places. I have used steel, on occasion, out of a 12 gauge, for shooting clay pigeons, and it does work, however, a clay pigeon "dies" much easier than a December rooster.
Hevi-shot is better than lead. But, I can't see it getting any cheaper, regardless of what the market demands.
Tungsten is a strategic material, after all. There are far, far, more important uses for it, than civilians shooting at birds.
I also can't see going out to a clays course with four or five boxes of 28 gauge hevi-shot loads for some pleasant afternoon shooting. Wal Mart sells Winchester lead AAs for $9 a box.
If we assume the mark-up difference between 12 and 28 loads will remain about the same, what would the price of a box of 28s loaded with hevi-shot be?
A box of 12 gauge lead AAs is about $5 at Wal Mart. Should we figure about double the price for 28 gauge hevi-shot, over the 12 gauge loadings?
This is going to be an expensive pastime.
Best,
Ted