Were you holding over or using your turrets for the come up?
I am at a loss as to why with a tac scope you would zero at 200 rather than 100 yards. The idea of having turrets like your scope has is to use them to adjust up for distance.
The trajectory for my 308 zeroed at 100 yards is 5.75 moa up for a 400 yard shot, so your math is good. Just wondering is all.
I was holding over and using the lower mil dots as an improvised crosshair. I know that using the turrets for the come up would have been propper but the last few times out at the range I was experimenting with using the mil dots as crosshairs so it was what I was familiar with. I was trying to work out a system where at 100,200 and 300 I could use the mil dots as cross hairs. I am sure the majority of us have probably tried this at some point with our first mil dot scopes. Seems like it would work good but in the end realize it is not the greatest. I hit the range a bunch in the last while after shooting this deer and have decided to put the MOA adjustments on the inside of my flip up scope cover to make life easier.