I think more is better, but it's more about matching the reticle to the target.
For instance, in HP we shoot a 4.5x scope out to 1,000. The 10 ring is 2 MOA and most reticles have a 1 MOA or smaller dot.
On a target bigger than this one, your 4.5 scope will work.
![[Linked Image from i.imgur.com]](https://i.imgur.com/Fx5YN52.jpg)
I believe the op is asking about a good scope for hitting a 12" target at 600 yards. Lets try to help the OP out, not hinder him with a 4.5x scope.