My experience at Cabelas when I purchased my Piettas showed me that the salesman was not too knowledgeable and to his defense even said as much. However I was fortunate enough to do some research before buying. The most informative stuff that I've read was from the forum. You need to read the "sticky" post at the top off this forum if you haven't done so already. I actually copied it and read it a couple of times and still go back to it when the need arises.
Oh and I use .454 balls because that was what the Pietta manual stated.
2nd AAV Bn