The 200 yard zero is good. The 7MM Rem with the 139's will still keep you on a coyote holding on the higher portion of the body, not over the back, at 300 yards.
But really though, if you are going to take long shots, you need to shoot/practice at some of the distances you expect to have hunt shots at. You can find some decent BDC scopes out there and with a good range finder, can help in clean kills, but just my opinion, unless you are used to shooting out to and beyond 300, you don't need to start there with hunting, that needs to start at the range.