Overcharge concern only entered in when thinking about a faster burning powder.
I realize the pistol powders are fast, but some off the shelf shoot-em-up ammo makes a noticeable flash/flame. I infer the powder is still burning when the bullet leaves the barrel.
I am not at all sure that flame coming out of the barrel means that the powder is burning outside the barrel. It could be many things other than powder.
I am not at all sure that flame coming out of the barrel means that the powder is burning outside the barrel. It could be many things other than powder.