Since Barnes has apparently forgotten about their .452 Buster 325gr that WC designed for them, I went looking for an alternative...found a .452 300gr copper solid from Lehigh Defense that has almost the same shape as the Barnes Buster, also costs at least 20% less per bullet:
http://www.lehighdefense.com/collection ... 1563566660
The 300-grainer should also be somewhat less sensitive to barrel twist rate for stabilization...