Serious Mistake check this out
I am very glad that you were not physically injured. I am also glad that we have this forum to share our experiences with others.
When I was Cowboy Actioning and reloading mucho .45 Long Colt cartridges I checked the weight of powder maybe three times in a run. I didn't have any problems.
Now loading 30-06 and 30-40 Krag I am after accuracy and I weigh every charge, you know, powder measure adjusted to drop in a little short and finish off with powder trickler and weigh. Good luck and load safe.