Just possibly, or probably, accuracy wasn't what he was referring to, I'd suspect. The compound radius (venturified shoulder and cup point) at the nose probably has problems with additional atmosphere interferance, ie: greatly reducing it's ballistic form over what would normally happen with a common, ogive, flat or round nosed bullet. This is prossibly what he was referring to, not absolute accuracy.

A straight sided cylinder of lead or copper will shoot MOA at 100yards and likely create even more tissue disruption than the Hydro bullet, but has a poor flight form.