457191 in the .45 Colt BH

[Swampman]

If I wanted to shoot the Lyman 457122 in my New Model Blackhawk could I size it to .454 or .452 in the Lee Sizer? Which would you choose?

[littlejack]

Swampman, slug the bore on your NMBH, as well as th cylinder throats. This will tell you what the boolit needs to be sized at.
I have read that a lot of Ruger owners have had to get the throats reamed on their handguns. The throats are too small for the groove diameter of their handguns.
Jack

[9.3X62AL]

I have a Bisley Blackhawk in 45 Colt (c. 1995) that I had to "finish building" by opening the throats to .453".

I use .454" boolits into those .453" throats that service the revolver's .452" groove diameter. Life is good. :)

I have used RCBS 45-325 boolits meant for the 45-70, which don't cast big enough for my rifle. I seat GCs and get a bit of lube in the grooves with a .459" H&I die, then run them through a .454" die to size and finish filling the loob gruves. The loob seems to relieve most of the sizing stress, and the boolits shoot well, from 900-1250 FPS. The GC is probably superfluous at the lower velocities/pressures.

[bigboredad]

if your throats will take it size to .454 if not size to .452 if your throats still don't take them open your throats to .4525 - .453