Doe at 200 yards, referenced to lawn chair

that was sitting at the edge of the woods and I knew that distance. White Model 98 .451 using home cast 426 grain conical bullets of bore size, 100 grains volume equivalent of Pyrodex P and a #11 RWS cap. 3x9 Leupold on 9x. Dead calm weather and had watched the doe feed (along with two others) for quite awhile before deciding to take the shot. I belly crawled about 10 yards to get the best position, shooting prone from one hillside to the next.
Deer never knew what hit her.