I've never had or used a tool.
Projectile of choice in brass of choice, seated as long as your die goes. Some people will tell you to slit the neck, I don't. Some people will say "you need to be seated at least a calibre depth into the neck", I don't (but usually end up deeper anyway). Colour in the slug with a vivid so you can see where the rifling touches. Single feed them and slowly cam the bolt home, and back. If you haven't removed the injector then try and get a grip on the case before it's thrown across the room. Test several. Average. Back off .02". Load Dev.
With this measurement I'm then confident measuring Base to Tip (rather than base to ogive) and still being safe.
Likely your mag lenght will dictate your longest COAL though.
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