I'd stick with the load you got, unless you're seeing pressure signs.
Oh, and I think that you measured that group incorrectly, because it's most definitely smaller the 0.475". I'm guessing you measured the edge-to-edge outside spread. The proper way to measure a group in center-to-center. To do this you measure the greatest outside spread and subtract the bullet diameter. In your case, you'd have 0.475" - 0.243" = 0.232", which even for 75 yards is a stellar group for a hunting rifle. This equates to roughly 0.31 MOA. I'd be tickled with those results.
Mike