G7 only has a significant advantage over G1 for longer ranges, basically beyond around 500, 600 yards or so. As the 53gn 224 VMax is regarded as a 'short-range bullet' in this light, people like Bryan Litz doesn't usually test such designs. Somewhat to my surprise though, he did include the 52gn AMAX in Ballistic Performance of Rifle Bullets and gives it average BCs of 0.234 G1 and 0.120 for G7. It's so close a weight and shape to those of the VMax, I doubt if there's any difference between them.
The Litz 0.234 G1 value is well down on that of Hornady's 0.290 which doesn't surprise me as he'll have produced an average value over a fair distance and Hornady's is more likely a single value for one (high) velocity only.