I have to say that this is probably not good enough and you are eventually, unless you're very lucky and your luck holds out, going to loose a barrel. I guess it somewhat will depend on the size of the pins you are using and the cases you are cleaning. Pins can get stuck crossways in a case and air wont move them, plus there is always the ones that get stuck in the flash hole.
There is no substitute for a visual inspection, inside and out of every case and this is, to me, the biggest drawback of this cleaning method.
A lot of guys complain about drying cases...I solved that one with denatured alcohol.
The real kick in the ass is that the barrel you loose will not be a Savage or Ruger American, it will be the custom tack driving hummer you waited 6 months to get and another two months to have chambered.
I know you probably wont change the way you do this, so I will just say, "good luck".....you're gonna need it!!!!
I have a solution to this problem. Use a air nozzle that fits into the case. Then you can be sure there are no pins inside. This has been quite effective for me. Drys the case and inspects all in one step.