5 1/2" barrel Ruger Blackhawk Bisley in 45 Colt. Not a shot fired yet. Put in a Wolff spring kit, Belt Mountain base pin and got rid of the cylinder scribble. The cylinder throats are pretty tight so they will get reamed next. I am pysched! Ohh, and with Grizzley 300 grainers at 1250 fps., she barks. A lot. Just found that out about two minutes before posting.