Heeled cast slugs?

So internet search doesn't turn up much. Anyone cast heeled type slugs? Seems like the design itself may lead to cockeye'd loading. I think either or both NSA and Griffin offer them but it the heavier weights.
Also would this be a single load type deal or do the work in magazines?
Are heeled slugs the same as boat tail slugs
 
Kinda, sorta but not really. The base is slightly reduced in diameter like a boat tail but it has a shoulder instead of a smooth taper like a BT. It resembles the base of a gas check bullet but much shorter.

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