Perhaps I was not clear on what I was suggesting. "Series" indicates that they would be loaded in a line. I thought that some small cup or buffer would be placed between the base of each short little pistol bullet and the nose of the following one. The bullets would be encased in a sabot.
I need to measure some pistols bullets for OAL, to determine if current off the shelf unloaded pistol bullets might work, or whether some type of custom projectile(s) would be needed.