I have an old sight card I found in some papers that came with a Ballard rifle I purchased. I had no idea what the marks on the Ballard Long Range sight might be in MOA, so had been guessing mostly. The lowest setting was for 200 yds. and said 43. The 300 was 66, and 400 was 80. It went close to around 15 per 100 yds., but not exactly. Once it got to 700 yds. that stopped, and 700 was 111, but 800 was 128, and 900 was 147, 1000 was 168.
But whoever had made up the card, and whatever caliber Ballard it was for had gotten pretty close! It puts me in the ballpark for both my .40-90 Ballard, and my .44-100 Ballard.