And the node occured where the velocity changed the most, so long satterlee.This is what I use for the standard ladder method. I make these graph charts with 1/4 inch line spacing and layout your charge weights for the range of powder charge. I will shoot this two times, low to high, so the charts will show the waves changing as barrel temps change some also. I will do the same thing for seating depth. It's very easy to see the waves smooth out when you hit a node.