I have not heard of LD62 media. I sounds like it is an equivilent to SCW 62 condtioned stainless steel shot. I suggest you contact one of the cut-wire manufactures for a cross-reference.
Bob Gillespie
Premier Shot Company
1203 West 65th Street Suite 1600
Cleveland, OH 44102 USA

Bob has presented several papers at conferences detailing the contamination from cast steel, cut-wire and stainless cut-wire.

Jack Champaigne (Dr. Peener)
Editor The Shot Peener