Tail Chain,
Per Wil Terry's comment,
SAAMI specs for .45 Auto show that with a bullet in place the outside diameter of the case mouth must be between 0.467"-.473" for proper headspacing. Also, if your cases have been previously fired and reloaded, note that unlike a rifle cartridge, .45 Auto cases tend to shorten slightly with each load cycle (about half a thousandth, typically). After resizing and before seating a bullet, use your calipers to make sure they are between 0.888" and 0.898" long. If they are shorter, that can cause ignition issues.
Also, having now looked through the instructions, make sure the three digits on the two cylinders match the last three digits of your gun's serial number. They need to match for the cylinder to be the one fitted for the gun at the factory. It's always possible in a gun store that had more than one, for the cylinders to have been swapped into the wrong frame.