I have what might seem an incredibly stupid thing to say, but what the Hell does one measure sour cream for?
I buy sour cream by the pint and the quart, usually the latter unless two pints are cheaper than one quart, which sometimes happens.
I either sup on it as if ice cream, or just grab a spoon and heap it onto things I'm eating, without any concern or care about its measurement.
I suppose there's things into which one can cook sour cream, but I'm a purist here; never tried them.