That does sound a bit odd. How high is your scope mounted? If you have really tall, like a see through, scope mounts it might be possible that it would be higher at 200 than 100. I ran some numbers through my ballistic program and I had to put the scope 4" above the center of the bore and a velocity of 3000 to get something that would producenumbers close toyourresults so I'm not sure what to think. At a velocity of 2600 to 2700 and a more typical 1.5" scope height, it should be within an inch of the same at 200 as 100.