Here's the link to Char Gar's post of how his range session went after he sent the barrel this way.
http://castboolits.gunloads.com/show...dos-to-DougGuy
There is another very long thread here from a guy trying to get the 452423 to work in a 1911, several pages worth, he finally gave up and conceded it could not be done. Same booit Char Gar is using, and this is before I started offering barrel throating and cylinder throat honing to members here.