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Breeding sg x sg will NOT give you ANY smooth feathered birds. Silkie feathering is recessive, so breeding sg x sg would give you 100% silkie feathering.
If your sgs are heterozygous for the nn gene (one copy) and you breed them with another het sg you would get: 25% silkie (no nn gene), 50% het sg (1 copy), and 25% homozygous sg (2 copies).
If you breed a het sg x silkie you would get 50% silkie, 50% het sg.
If you breed a silkie to a homo sg you'll get 100% het sg. het sg x homo sg will produce 50% het sg, 50% homo sg.
The way you can tell whether the sg is het or homo for the nn gene is to see if it has a "bowtie": if it does, its heterozygous, and if it doesn't, its homozygous.
If you're looking to improve type, I'd suggest breeding a sg to a good silkie and going from there