It could be that your rifle doesn't shoot flat enough to have a 200yd zero. I don't really know how your bullet would shoot, because i have no first hand experience with the powder or the bullet. The chart below is based on a 2000fps muzzle velocity, but i don't really know if that is reasonable for your load.
Assuming that the chart is in the ball park,one can see that sighting in about 3 1/4" high at 100 yd results in being about 3 1/3" low at 200 yd. Trying for a 200yd zero may result in the bullet flying too high for hitting a critter around 100yd.