According to the Hodgdon reloading center (they now distribute 231), your load is .3 grains below max for a lead round nose.
They show 4.8 grains as max, generating 1135 fps.
I know that in the past I have used loads even heavier than that with 231, but that is after years of experience with that powder, so I definitely do NOT recommend that you start down that path.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.