You have the right idea, however the results are so random that reaching any conclusion from this is futile. A ladder test at 300 yards is IMHO the best way to find the node. Finding a node will allow for some variation in temp and charge weight without having vertical dispersion down range. That can be the difference between a kill, crippled animal, or total miss. Once proper charge weight has been determined, groups can be tightened by varying the bullet seating depth. The final step is to determine the ballistics for the load to as far as you are capable of shooting. I must say that by the ladder test photo shown, I would be hesitant to shoot that rifle beyond 50 yards. It probably won't make minute of pie plate. I had a 6 SLR that I never could get to shoot. I rechambered it to 6 Dasher and my wife now uses it as her target rifle. It shoots sweet. Hopefully, all of this has my looney status high enough to keep me in good standing.
