It seems I recall using a large glass bowl once, and there was a hint of static charge on that. On a stainless bowl, never.

Sorry didn't see that. I went through the same thing when I had to mix five pounds of 4350 and was told by several people not to use metal. I believe it is from the static but not sure the exact reason. But the info came from a very knowledgable person with many years of experience so I took his word for it... I used a big plastic bowel and poured a little out of each container at a time until they were all empty then kinda swirled the bowel around to mix it up. One of the hardest parts is trying not to crunch or break the powder up into small pieces.

Walter

Of metal, glass, and plastic, you're going to see more static buildup with plastic for sure (except the plastic they're using for powder containers these day, obviously). Maybe someone was mixed up, or maybe thinking about the requirement that that you use brass equipment for handling black powder.

No biggie.

I would bet that the adversity to metallic bowls is to eliminate any chance of a spark developing. I know when fireworks manufacturers mix their recipes for artillery fireworks, they use plastic bowls and either plastic or wood instruments.

RE: Mixing - how do you determine you have a good homogenous mixture between the two lots, and not a case where you have pockets of one lot here and there in your mix? Granted, with pouring back into the container and then pouring into your powder drop you probably have minimized this probability, but seems to me there is no good way to verify that you have an even distribution throughout the mix, and therefore can't guarantee you have a consistent burn rate from round to round. As I said earlier, I'd never notice with my shooting and equipment, but if some of you can notice from one lot to the next, seems you are exascerbating a problem to me.