When you say dead calm - what are you using to assess that? 1 m/s wind full effect would give you maybe 6cm of drift at 400. 1m/s is not very much wind.
Re: tracking straight - does the scope track in a straight line dead vertically ? is the tracking aligned with the reticle.
2 shots at 100m doesn't give you enough information to be confident in your zero. It might be good or it might not - could easily be a click or 2 off. Especially if you are basing your MPOI at longer ranges off equally small samples.
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