It won’t hurt having one.
BUT
Do things as you have been doing things and don’t bring your chronograph into the equation till you’ve got a good looking load.
This keeps you from chasing numbers, like book velocities.
As for your beyond 500 issues, your variations in velocity are your nemesis, as are the nut behind the bolt(you) and your optics, and Mother Nature.
But your velocity variations come from a miriade of variables, often due to your processes, tooling and components more so than mere powder charges alone.
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There are no absolutes
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