Not having owned a Hawke Varmint, are the mildots true mildots at 12x mag?

You need to get a MV reading, then the things to check are... have you twisted the barrel while fitting the stripper?. What's the MV, with and without the stripper? What's the actual drop in inches (not mildots) between 50 and 55 yards. Or better still, what's the drop between your zero range and 50 & 55 yards.