Ok, time to try a different pellet. I have a gun that shoots the most popular pellet like a laser for 38 yards. past 45 yards, it won't stay on 8x11 paper.
I would also work up to 100 yards in 10 yard increments. 50 to 100 is a 100% increase of the base distance. Take small bites and enjoy the flavor of each bite. It will also help you learn your hold overs or clicks for each distance. I prefer real world results over computer generated predictions. Yes,, there is a place for ballistic programs, but I still prefer real world empirical results.