I say this with the utmost respect for you and this rokken project, but I believe your calculations may be off. Pewters are not homozygous for pastel, so the dam isn't guaranteed to have thrown a pastel gene and you could have some pewters in there. (However, everything should be a pewter at a minimum, as the sire was homozygous for both cinny and pastel.)
Like this:
Male: Super PewterFemale: Percent Fraction Traits 25% 1/4 Super Pewter 25% 1/4 Sterling Pastel 25% 1/4 Silver Bullet 25% 1/4 Pewter
That being said, the only one that even look a bit pewter-ish to me is the 1st one, and even with him, I couldn't say 100% ... He just looks a lot darker than his sterling sibs in the picture. Pretty awesome clutch!!
So is that degree of wacky, broken pattern normal for silver bullets, or do you think the really cool one in the last picture has some "urban camo" influence?