Short range zeros introduce too much error. Test it at least as far as you're going to actually shoot it. Given past experience, I'd probably first sight it at 100, check it at 50, and, depending on trajectory, probably adjust it so it's the same amount high at 50 as it is low at 100. Unless you're trying to shoot squirrel heads, that'll be good enough .. certainly good enough for boiler room shots on medium game animals.
Tom
