You might be happier with the .454 chamber. The chamber specs on the .45LC are 136 years old and are oversized to accomodate black powder fouling. The .454 chamber is held to tighter specs and usually has a better throat. OTOH a Bullberry chamber I have is nice and tight and shoots very well
.
Thanks Lone Star and Grumulkin, Out of all the .45 Colt rifles I have or had, the one with the tighest chamber is a H&R Classic Carbine.
The Marlin 1884 .45 Colt had a sloppy chamber. The Puma 1892 .45 Colt ejected brass that looked like a banana.
And the Browning 1885 shot 6"-8" groups at 50 yds. no matter what you fed it.
I think a custom barrel from Bullberry or OTT with a proper chamber is the way to go.
Thanks, .375 Hawk