Yap, but you can't shove the .452 down the "bore" of the barrel without a rod and a hammer . . . just like a Blackhawk, Colt SAA, Uberti Dragoon, Pietta .44 Army/Navy et al.
You're correct in that the ROA is a ".45" but just like the Uberti /Pietta (and others) are ".45's".
My 5 ROA's...