True.....measuring the S/G of nitro in mixed fuel is nothing but unsliced baloney.....can't do it.
The only way nitro's S/G can be measured is before it is mixed with anything.
Not that any of us could do anything about it anyway.....
Well....I guess if the S/G of the nitro to be used is 99% of whatever it is supposed to be....1% could be added to make up the difference....but....the only thing that would do is to add to the expense.