Craig,

The meltplate on my 255's is .337, measured with my old style dial caliper. (I'm not aware of anyone casting the LEE 452-255RFN commercially.)I'm sure that's not 'exact', but it'll be withen +/- .005 which is similar and heavier than Beartooth's 225.

If they shoot well in your Rowland and you run them 1150-1200fps, I'd wager they'd break down a black bear or elk just fine. If I'm remembering right part of the army's desire when they were looking at the acp was that it duplicate the old .45 Colt load (250rfn @ 900fps). They seem to think the 230gr in the acp was close enough that they adopted it. So, you're only giving up 25grs (and putting a little more shove behind it).
Just some random thoughts.....

Russell