For a while, it was not uncommon for Contender shooters to load .452 bullets in .444 brass, as it is merely long 45 Colt brass tapered to fit .429 bullets. You would want to fire-form them to your chamber, I suppose, as i have had bad luck trying to put .452 bullets in odd cases. I could not fire-form as i had no chamber to do it in.
I don't know what you can do about sights.