I asked the same question to Roy Huntington (Editor of American Handgunner).
His reply was that the barrel of a handgun does not need the same particular break in as the rifle.
Just clean it and shoot it.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)