My go-to for conventional hunters is Swaro, all the way back to the old AH 3-9 and all the way up to the new Z5 and Z6 - they are super easy to get behind and have amazing glass.
Beyond that, the march 1.5-15 is great too, I run that on my go-to 300WM just because I want 1.5 for thermal, and at that it works beautifully.
ZCO and TT both get a nod, I run both, I love both; but they aren't superior on a hunter to the Z6i's... and they are bulkier for some other options, if balancing an optic on a not-heavy-barrel behemoth of a rifle.