When I was young and daft I chucked some duds on the bonfire, I did have enough sense to remove the shot first though, got a right bollocking from my dad. The shot can be melted down recycled as slingshot, balancing guns, fishing weights/diving belt weights (takes a lot of shot though), just don't use your mum's best pots (not me guv, honest but I did hear of someone burning through the pot and lead getting all over the range)
I've only had a couple [SIZE=14.3999996185303px]since I took up clays again, [/SIZE]part of a really bad batch of Clever T1s the local strawbale club bought and they were returned to the supplier.