A Giant RAPTOR to a Super Snow would result in 50% Mack Snows het RAPTOR and 50% Giant Macks het RAPTOR. You would not get a Super RAPTOR in the F1 offspring because you'd need two Snow genes and two RAPTOR genes present, at least somewhere in the genotype if not in the phenotype.
However, breeding the F1 offspring back together, such as the Mack het RAPTORs, you'd have an extremely small chance of producing a Super RAPTOR, and you'd have an even smaller chance of producing one with the Giant Mack het RAPTORs being bred together.