Well, I think it has been well covered here. I think the reigning and conventional wisdom is that you need to feel reasonably comfortable with the firearm's performance with the style of carry (Open vs closed), holster choice and ammo choice (whichever brand works consistently) in your carry weapon. This will differ for revolvers and semi-automatics and from brand to brand of ammo and holstering. If you have a gun that shoots and feeds consistently well but you cannot draw it effectively to bring it into play, for instance, - you might as well be unarmed. Have you ever asked yourself how many carries and draws are necessary for your holster to be "broken in"? How many successful safe and consistent and on target draws until your draw is "broken in"?
So, do yourself a favor and don't get all hung up only on assuring proper break in of the gun - yes, its important - but, everything has to work in harmony to be successful.
And, so as to avoid coming across as preachy, I would agree that 200-500 is the average "break in" count for most brand new guns (your users manual should have recommendations to this effect); if you have acquired a used firearm, may not be as many but you need to make sure all the components are in good working order before carrying.