You asked:
If 9mm Luger, I shoot my home cast 125g LRN over 4.0g of W231 seated to a OAL of 1.135" in my Colt's (9mm Competition Model, 9mm Combat Commander)
My older Lyman manual indicates a Start load is 3.9g W231 and Max is 4.4g W231
My above load is reasonably accurate (at 20 yards) and very manageable as far as recoil.
As above its always in your best interest to consult a loading manual before proceeding.