You guys are paranoid about safety!
For heavens sakes we're not talking about exploding hand grenades, we are talking about a little primer and we are a group of shooters and reloaders, not a grade one class discussing this in school.
A fully loaded 30-06, or similar round, sitting on a flat surfaced stove until heat fires it off, is close to being harmless. In this case the bullet will fly up, leaving the case sitting on the stove, but the bullet won't have enough power to penetrate one ply of cardboard, at feet above it.
I have never placed just a primed cartridge on a stove like this, but I am convinced one would hear a pop, and the primer would be intact in the case.
As a point of interest, a 22 long rifle rimfire does more damage and makes a louder noise, when fired from sitting on a stove, than does a 30-06. This is due to the faster powder in the 22 and the case being so light that it ruptures and close up, one could get hit with a piece of the sharp case.
The waste basket by my loading bench collects bits of scrap paper and old rags, etc, along with spent primers and quite often some live primers find their way into the waste. We usually burn the refuse in our fireplace, which has glass doors. My wife has told me, "There were some pops in the waste from your loading room." I have sat by the fireplace and seen dozens of primers explode. There is not enough force from them going off to even blow refuge around, in the fireplace.
You want an undamaged fired off primer in a case? stand your primed case on a flat metal surface, like in a flat flat bottomed frying pan, in your oven and turn on the heat. You super safe guys could leave the oven door open and to be really super safe, don't stand in front of the open door.