Screening / Grading Black powder

[country gent]

I have seen the equipment for doing this for sale at several places to screen/Grade black powder by grain size. What are the Advantages / disadvantages of doing this? Are there any real visible benifits? Does it improve standard deviation or accuracy?

[RMulhern]

If folks spent their time paying attention to the Rules of Marksmanship rather than all the bullschitt such as this they'd find that they'd be better off!!