Ballistically there isn't much advantage, or disadvantage, to the .52. As mentioned, there's sabots available for .458 & .475 bullets and Parker makes a couple lead conicals for it. The fact the rifles are discounted would be enough for me to go for one IF I were in the market for a new ML. That's just me, but $320 for a Freedom Series Disc Extreme isn't a bad deal.

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Ancient order of the 1895 Winchester

"It's an insecure and petite man who demands all others like what he likes and dislike what he dislikes."
szihn