Why would a piece of blank ammo have a wooden bullet on it? Blank ammo is the stuff that just goes "Bang" without any bullet at all IIRC.
Here in Germany the blank ammo has no bullet or anything that might look like a bullet. It's just the cartridge that is closed at the top (where the bullet would normally close it).
Here you can see nicely the difference between the ammo types:
Found here:
http://www.inetres.com/gp/military/i...56mm_ammo.html
As one can see, the blank one looks quite differently.