Funny, I read the whole thing and it wasn't until the last few posts that I noticed the dates.
I have a BFR in 475/480 and have only shot 480's out of it so far. I have a SRH in 480 Ruger that punishes you with the factory grips. I can only shoot about 20 rounds before I can't shoot anything for a while... that is shoot anything and hit with it. But I use the SRH or deer hunting and it does the job. I still haven't shot them side by side yet, but I will in the next few weeks.