By "people" you mean me? I have heard of a diameter .001 or .002 larger than bore but have not read articles or posts or reloading manuals promoting .003 oversize. So how much DOES it raise pressure by? If I could measure it I would and deem it safe if it was. I can't so I'm cautious. I also don't know a lot of Firearm history so I can't reason that back in the day they used to <insert anything> and not many died of it.
It is good to know someone has tried .003 larger than bore with good results though. I will probably save those for my revolvers... Unless accuracy is spectacular in the 9mm.