I have Billy Dixons book. In it he talks about the adobe walls shot. He said it was luck but I don't agree. He states that the only entertainment in the buffalo camps was drinking, gambling, and target practice. He remarks that since he didn't drink or gamble he shot a lot. In later years after he owned the ranch at adobe walls he took a picture of the outcrop that the Indians were on. Just under the crest is a large white spot, a rock maybe. I could not live there without shooting at it. You can be sure Mr Dixon knew exactly where to set his sights to hit near the spot.
There were about 30 Indians setting on their horses at the crest. He didn't shoot at a man, he shot into the group. Quanah Parker was in the group and I think he said the man was hit in the arm but still knocked him off his horse. Woody
If I recall it was 1530 yds or thereabouts