Trail Boss is so "un-dense" that you could probably scoop the cases full without weighing (just kidding).
Seriously though, how many grains of TB can you get into a 45-70 case? I really can't imagine a powder & cartridge combination where a couple tenths of a grain could be anymore meaningless. You probably got more variation from the amount of time you had a cartridge chambered before firing.
Glad you had fun though!
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