I remember way back when, we used to just buy a rifle and shoot ammo in it.
Then came the internet and suddenly we need to know the dimensions of twenty different variations of the chamber down to the last ten thousandth of an inch lest the gun that is made from the same steel as every other gun somehow magically explode.
You really don't understand how a chamber is cut do you?
Doing what you suggest would only increase the headspace regardless of what the chamber was originally which would definately NOT be "good to go."