Originally Posted by goodgrouper
We've had this thread get pretty fired up before in the past so let me just say that the math involved in this shows the answer. You'll get the idea if you consider the fact that the odds of getting two lots of powder to have the same identical burn rate aren't very good. Then adding the two together are going to make it slower overall or faster overall. Then the odds of getting a mix of 50/50 in any given charge in a non-fluid solution and oh my, my calculator won't go to that many digits!! Let's see, the odds of winning the Idaho state lottery are................
I wouldn't hesitate to mix the last few grains of one in to a nearly full tin of another. But I agree with the above on mixing 50/50. Maybe it wouldn't hurt, but I personally just wouldn't want to chance it. If you had one of one very fast lot, and another of a very slow lot...it could IMO, create a problem.