IMO, no one should be touching a tool to a ramp or a barrel unless they have the skill and the tools to check if the geometry is correct.
Been throating barrels and polishing feed ramps for decades, I don't have any tools to check if the geometry is correct. Honestly, I'm unaware of any such tools.
No geometry changes should ever be made. Polishing a feed ramp involves taking as little metal off the feed ramp just to remove any machine marks up; geometry shouldn't come into play.
Throating a barrel that has not been throated means taking the throat that's already there and carrying it up about 80 degrees on either side. The geometry of the throat never chances, nor should there be any less support on the case head. I will check with a fired case periodically, but it's a visual check (you can eyeball down to a thou).
