I usually use 5.9 grs of 231 for 230 gr full metal jacket. If I am loading 230 gr hollow points, then I use 5.4 grs of 231.
I know 5.9 for a 230 fmj is considered hot or exceeds the recommended loads in some of the newer manuals, but... I have inherited my grandfathers and fathers library and they date back to the 50's. 5.9 was considered middle of the road.
Also, you have to know your gun and its tolerances. I shoot this load in a proven 45, I know it can handle my loads. I would not try it in some of the newer guns on the market.
Load with caution, start with a lesser amount of powder and work your way up until you find the load that works for you and your purpose.