Keeps people thinking of creative ways to work up their loads.
I will say that when I am working with a wild cat with no known loading data in print, that much can be learned by shooting two shot groups to initially find out what kind of grouping you can get with various charges, especially used in conjunction with a chronograph.
Custom barrels will often put the bullets in the exact same bullet hole, which is what you want to see. Then verify on later occasions, even better if you can reload right at the rifle range.
It is nothing short of amazing how a primer change or seating depth change can alter groups.
