A few minutes with the micrometer and I have discovered that bullets from CNC produced multi cavity molds are extremely consistent. I was measuring to see how much my new "discount tool store" powder coat increased the diameter of the cast bullet after application.
I discovered that on good cast bullets the mold block lines are hard to find, they are so close to round it is unbelievable, and cavity size seems to be within 0.0005" or less on a 4 cavity mold. Alloy temperature and mold block temperature cause more variation in diameter than the difference between cavities in a quality CNC machined mold.
This is true of NOE Molds and Accurate molds