If I cross a Blue Marans with a BCM, what do I....

When you say Blue ,just what are you talking about? Do you know the exact genotype of the birds in question? A Blue Copper Marans or a solid Blue Marans.
As these birds have different genotypes you will get different results.
If a Blue Copper Marans is mated to a Black Copper Marans you will get approx 50% each Blue Copper Marans & Black Copper Marans .
If a solid Blue is mated to a Black Copper Marans you will get 50% each solid Blue and solid Black. They may however have the odd red or silver feather showing, the colour depends on whether the father is silver,gold or split silver/gold based.
David
 

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