i hope you laugh at this.....
today i patched up a few 303s to test,loaded them over 13 grains of red dot.
i had five that did not look to hot,so,i put valve grinding compound on them and loaded them.
i thought i would see if i could clean up a real dark bore.
i drove 3 miles to the range,met a buddy,and asked him to look down my bore to see the before and after;and see if we would agree as to how much brighter it would be after.
much to my dismay i left the bolt home........
well i DID get a bunch of brass 9mm,40,223,270wsm,270,380.
we had a good laugh over it,i hope you have done something similar.