How much carry ammo is enough?

[rbeau30]

This may be a bit over-reaching the intent of this question, but here goes:

When time and occassion permits, I will reload.

The other part is that you never know if there will be a malfunction within the weapon system itself, which would then require using a different ammo source.

You never know when you have to go through S-P-O-R-T-S drill. Ohh wait that is when I carry the AR pistol.

You never know when you have a malfunction to the point where you have to: replace mag, charge, continue stopping threat. However at the point where I have to draw down is going to be the point at which I cannot flee or do anything other than stop the imminent threat. So possibly I may not have the ability to clear the malfunction.

Or carry a revolver, pull trigger/go bang.