Rocky, that is an excellent observation, and true. ... felix
For those with fixed sight guns, pick a boolit, and load 6 grains of each powder on the shelf in that speed range. Make 5 rounds of each. Shoot for POI at 50-75 feet. When satisfactory, alter that powder's load by a few percent to close the group. I took me 6 months off and on to get THE load for my SSA. ... felix