I know all the concepts like COAL and I have figured out the OAL to the lands for the 2 different bullets I want to try in my rifle. I read the ladder test to get to max powder charge and the seating depth test as far as starting at lands and working back to find the best oal. My question is do I find the oal first that my gun likes using a low powder charge? or do I find the powder charge I and my gun likes and then the oal? or do you guys try do do both at the same time. Thanks for the help.