Muzzleflashes unrealistic?

[swiss]

Originally Posted by Sternjaeger

as soon as it leaves the muzzle.

Tracers were either ignited by the combustion of the powder or by the contact with air.

Contact with air?
How do you wanna do that - create an anaerobe climate inside the cartridge? If so, where do take the oxygen needed for the combustion from?

There is a reason gunpowder has the shape of lil' balls(or cylinders): More space for O2 in between.

Please correct me if I'm wrong.