I'd also recommend the Strelok app for holdovers if you go that way. After you enter your load data it'll show you what the various holdovers are on your reticle, depending on the zoom, etc. It also has basically every single reticle. Has worked well for the holdovers on my VX6 with my 308.
As mentioned by Bill, with a 223 it's probably better to dial rather than holdover. At the ranges you'd be using holdovers you won't have as much margin for error as a larger cal. And if it's for varmints then you'll probably want to dial anyway.
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