Gonna be starting load development for my 264WM, and have decided to give ladder testing a try since I have never done so. I've done a little research and got the gist of the process. I know to aim at the same POI for each shot and look for a close vertical grouping to determine the sweet spot. Once I have that narrowed down, I can begin fine tuning a load. I just have a few questions about the process. Hoping you guys can give me some pointers. 1) I have some rounds loaded to use as 'fouler' shots as I am starting with a clean barrel. From what I understand, I should fire a couple rounds to dirty/warm up the barrel, correct? 2) This sort of relates to #1. Should I clean the barrel in between each shot of different powder charge? Since each round is of different powder charge, do I want to 'wipe the slate clean' so to speak, fire a fouler, and then the actual test round onto the ladder test paper? 3) How long should I wait between shots? 1 minute? 5 minutes? As long as it takes to clean the bore (if that is something I should be doing)? 4) I was planning on shooting at 400 yards. I was thinking this would be enough to get separation/nodes, without being too affected by the spring time Colorado wind. Obviously, I will pick a day to shoot that has as little wind as possible to keep the shots on the paper, even thought I am mainly concerned with the vertical patterning. Is 400 yards enough to get separation? I know the 264WM is a rather flat shooting round, so perhaps 5 or 600 yards would be better?