Well, after 15-ish years of reloading I finally had a squib. I did what I was trained to do when I felt the reduced recoil and heard the different sound, stopped shooting, announced "squib!" (even though I was the only one on the range) and then opened the cylinder and looked in the forcing cone. I could see the base of the bullet, so I was done with the LCR for the day. Shame, too, I was shooting pretty well.