"Shoulder mirage" is that last glimpse over your shoulder of your wife's angry face as you head out the door to the range for the third straight day.
If you're not careful to maintain concentration, that last image will hurt your shooting because you know you're going to be getting a big 'ol earful when you get home at the end of the day.
BTDT!
Here are a few images of the bore and crown. Pretty ugly. BTW I have also run Tubb's Final Finish through it in the past and it still looks this bad. The crown could be fixed but these are throughout the bore.