I know this isn' t the way most do it. But it works for me. I like to have a baseline with a new rifle. So I shoot factory shells out of it first. Then I set the COL so I have at least on caliber of the bullet in the brass, but still fits my magizine with room for 1/100" or more. Then I play with the powder loads starting at min load working up. If that don' t work, I will change to another powder. If that don' t work, I start varying bullet depth. I usually don' t make it past changing to a second powder however.