Keep in mind that B/P and it's substutes, are very forgiving on the grains. Unlike smokeless, you can be a few grains off with little or no difference in performance. Being a little off with smokeless, can be and has been fatal. However, I have visually seen too much of a difference from pellet to pellet and we all know that consistancy is the key to accuracy. Whether you measure or weigh, do it the same way every time as well as how you load. I tap my barrel after loading the powder and my shooting buddy, bounces the buttstock on top of his foot and we do this consistantly.
Be Safe !!!