Re: 1/2" or 1/4" MOA?
I have used .5 MOA adjustments with good success on big game. In practice, the most you will ever be off your dope will be .25MOA, or under 3" at 1000 yards and this can be easily adjusted for if you wanted that level of precision. This amount is about the thickness of many crosshairs at that range. In recent years I have prefered finer adjustments largely because I have been able to achieve far greater accuracy with a couple of my rifles shooting .25 MOA or better. Whether or not it makes a practical difference in most my hunting, setting very precise zeros, and having bench rest level capabilities in my hunting rifle is not only a good confidence builder, but also more closely aligns the scope's capabilities with the capabilities of the rifle. In the end it contributes to my goal of continually tryng to increase my effective range. If .5 MOA concerns the OP I would suggest looking into another scope. There are too many good scopes out there to toil over the issue.
"Let us speak courteously, deal fairly, and keep ourselves armed and ready"-T. Roosevelt