Apologies if this seems a rather daft question, but should the shooter stand just behind/ at the firing line - as with the "ocky" in darts - or should the pistol barrel be just behind the firing line?
Stand so that your toes are on but not in front of the line.
The muzzle of your gun will be in front of the line. How much in front depends on the length of the gun. And of your arms.
Jim
UBC's Police Pistol Manager
"Nasty, noisy things, revolvers, Count. Better stick to air-guns." Sherlock Holmes, The Adventure of the Mazarin Stone