It didn't work that way for me. My first-year New Model Blackhawk .45 Colt had horribly mis-matched cylinder throats and barrel. I sent it back with a note saying if you have to replace the barrel, replace it with a 5 1/2" barrel (it was 7 1/2" when new).
I got a bill for $125, which was what I paid for it in the first place. They also kept my original box and counterbored cylinder. It still doesn't shoot well. I thought if it wants to be a scattergun, so be it--it's now relegated to shot capsule duty. It works fine for that.