"...dont list the Winchester fmj 115gr bullets..." Load for the bullet weight. Who made them or what kind of jacket doesn't matter. 4.7 grains of 231 is the starting load for a 115 grain jacketed bullet. The GDHP load. WSF powder is given for a 115 grain FMJ though. 4.9 to 5.7.
Then work up the load. Do this.
Beginning with the starting load given in your manual, load 5 rounds only. Go up by half a grain of powder, loading 5 of each keeping them separate until you get to the max load in your manual.
Then go shooting. Shoot at 7 to 20 yards(depending on what you're using the pistol for), for group only, slowly and deliberately, off a rest. Change targets between strings of 5 and allow time for the barrel to cool(not usually a big deal with a handgun). When you find the best group, sight in. Assuming adjustable sights.
"...Rule #1: Make sure the gun is loaded, and your finger is on the trigger..." Nope. Rule #1, pertaining to firearms in social situations is, "Have a gun." snicker.
