No, you loose nothing, other than the 3.5 - 5 bottom end. Possibly even better given the 52mm vs 44mm objective. I bought my Z6 as a demo unit from Euro Optics, great to deal with.
20 Tac is awesome. Had a couple of 204R before I had the Tac built. Tac has great brass (Lapua), mine is pushing 40gr vmax at around 3,950fps. 5 shot 0.5-0.6 MOA easy. Using N133 and CCI450 primers...
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