Someone else may have already mentioned:: always visually check the powder after loading the round in your tray. When you are done putting the powder in the cases, compare the levels in the group to each other. There will be some difference between mixed brass, but you will learn to pick out a significantly different powder amount. I do not think you would not notice a 3 grain or more difference—in the 223.
I have had a number of squibs in pistol loads from my progressive while loading very light loads in the 9mm.
I have had a number of squibs in pistol loads from my progressive while loading very light loads in the 9mm.