Just as an historical note, a gun book I have mentions that Netherlands police used to carry revolvers with a load ordered something like this:
2. Cork Bullets
3. Tear Gas Round
4. Regular rounds
BTW - is carrying a blank different from the crowd who states they will come to the top of the stairs or out of the bed room racking their shotgun deliberatedly to scare the BG?
That's compared to folks who keep it unchambered but rack as soon as they pick it up.