Powder weight vs. volume

[Catfish]

If you have to ask the question the answer is no. The gain in accuracy is soo small that it will show up only in the most accurate bench guns. Unless you are shooting tight necked chambers, trunning neck and weighting cases there in about no chance you`ll ever find the difference. It is one of those thing that you can prove on paper easily, but is about impossible to prove in real life.