I get a visually obvious uneven chamfer when using my Sinclair brass prep machine. Is this something to be very concerned with? The chamfer attachment has a slight wobble and is the same where ever I run it on the machine.
No problem. The purpose is to help flat base bullets start during the seating process without gouging the jacket and it helps on boat tails also. The effects of precision will be nil. It may not look pretty but 'only your hairdresser will know'.