You are probably right, though I've seen pretty big differences from one load to another (though one was drastically underpowered to the point of being dangerous - oops). That could be the load or it could be the squishy thing pulling the trigger and aiming the gun. I haven't bench tested it yet. My point remains that if you build the load you can tailor it to your gun and what it likes and keep it consistent. I may also be exaggerating the amount the gun is off but it's more than a couple of inches. I use batch processing (usually batches around 50) and do fairly well but only shoot around 100-200 rounds per session. I do use the Hornaday Lock-and-load system which makes die changes very fast.