You didn't mention the range your were shooting at, just the 100 yard zero, but according the ballistic calculator I use the come up is 11.69MOA at 500 yards, so I assume that is the range you were shooting at.
There are a couple reasons your data could be off. Did you chronograph the loads? They may not be exactly 2700fps. If they are going 2900fps the come up is 9.51MOA. Another thing that could affect it is that BC is not static with velocity and atmospheric conditions. If you look up BC on Sierra's website they list different BC's for different velocities to compensate somewhat for this. I think they are the only company that does that. Published BC is really just an estimate for bullet comparison and to get you in the ball park. There is no substitute for actually shooting your rifle and learning your combo at the distance you will be shooting.
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