yes,
my is/was, but should not effect the accuracy too much.....hopefully, as it is on loan to a friend of mine who is putting it thru its paces. This is the reason most re-chambers are done....to cut out the mis-aligned bore/ throat with a new one. The 460 is just a longer 454, and if your chamber is off center, then only the new chamber end extending from the old 454 chamber to the new 460 will be in alignment. Below that, the brass will not be concentricly round. You can sort of then neck size your fired 460 brass, but must align it in the same position it was fired in to go back fully into the chamber, or just do a full length size each time.