Keep a log, for me powder charge adjustment moves the bullet on paper more than different bullets do. I am usually close but not quite at max charge for most accurate and cycling in my pistols. 9MM is more finicky than 45acp.
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I found a chronograph to be hugely helpful. It took the guess work out of a lot of what I was doing.
You can get a good one for under 100 bucks.
Any updates on those Palmetto Projectiles? I'm all out of 208gr amax so I was going to order some up