I botched installation of a "White Lightnin" vent liner in my .50 cal. T/C barrel. I must not have cut the threads deep enough and in seating the liner "manned" it in and must have just about wrung it off. I could see a surface failure in an arc about 1/3 of the way around the opening of the vent indicating separation within the vent liner.
I figured if it blew out it was just going to hit the side of the smokehouse, but after several shooting sessions, it was apparent that I had sacrificed both ignition reliability and accuracy from it's previous self...and I just didn't trust it. It's not a great barrel but it has been a decent barrel. I just can't leave well enough alone and have been installing "White Lightnin" vent liners and peep sights on about all of my rifles. I was now shooting 12" shotgun patterns all over the target at 50 yds.
Back to the gun room, I removed the liner, cut the threads a little deeper and installed a second "White Lightnin" liner, being a little more careful this time.
Back to the range, accuracy has returned. In fact, of ten shots fired at 50 yds into a 2" orange bull, all have been contained within the 2" bull.
![Smiley :)](https://americanlongrifles.org/forum/Smileys/default/smiley.gif)
Everything else had remained constant as far as variables go. Same lube, same ticking, same balls, etc. It was the poorly installed vent liner.