With 230 gr RN lead bullets, you can use 3 to 3,24 gr max (speed: 777 f/s)
You get also good results with:
230 gr FMJ - FP bullet : 4 gr (751 f/s)
185 gr lead (lyman mold n° 452-389) : 3,24 to 3.54 gr (777 to 849 f/s)
201 gr lead (Lynx-HR n° P 1158) : 3,85 to 4,16 gr (813 to 869 f/s)
(data recorded on french MALFATTI Reloading Manual N°5)