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I haven't found anything from Big Green, themselves that says definitively what MC means.
Took a while but I found a direct reference from 2009. They use the "metal case" term for a bullet that is described as "UMC MC" in an accompanying table.
"Initial loadings will be the Remington Core-Lokt® or Premier® AccuTip available in 125 grain bullet weights and a UMC® metal case practice round loaded with a 123 gr bullet."
Remington Introduces 30 Remington AR