How long are your shots?

3" high at 100 ought to get youto 300 yards with next to no holdover.

On the other hand, if your shots are usually under 100 yards why would want to be 3" high? Go for a100 yd zero.

Personally I like a 200 yard zero (not 1.5" high at 100, actually shoot at 200 yards) you might be surprised. Then shoot at 300 and 400 to see what the holdover really is.