I was confused by the chart too. According to the chart, my shots should be high at 100 yards compared to 50, I think. I sighted the gun in at 50 and when I tried 100 I shot in the same group. I am still confused about how this works because I got different results than I should have seen. Where is the gun sighted in at that was on the chart? Maybe I'm just not accurate enough to see what the difference is. My groups are around 3 inches, sometimes a little better. I shoot a flinchlock
I push 295gr HP Powerbelts with 80gr 777 out of a 26" 1:48 twist tube.