I have always enjoyed John Barsness's writings. I remember reading about brush-lapping. If memory serves that method is used for smoothing tooling marks out of barrels. I don't know if it would remove a constriction from a revolver barrel.
I fired the revolver quite a bit over the weekend (See Post #15) and my crappy bench shooting technique aside, it's shooting very well. The only fly in the ointment is it leads somewhat at the start of the rifling, but it's not terrible, especially with slower burning powders and I can mitigate...
If I said here that I was working on a 45 Colt, my apologies, it's a .44 Special. I DID recently buy a Flat Top Convertible in 45 Colt, but the subject of this thread is my .44 Special.
Guess I should post an update.
I tested for accuracy and as always, I'm the weak link as I SUCK at shooting groups. Typically the first 3 or 4 plop into a nice little cluster, then I blow it with the remaining shots. That said, it's easy to see that the revolver is now a SHOOTER!
When fire-lapping I try not to waste my daylight shooting time, so I do that at night. 2.5-3.0 gr. of Bullseye or IMR-Target is about perfect.
The forcing cone cutter is a kit from Brownells. It does have the brass taper plug and I have tried to use it with lapping compound. You can probably...
The constriction is gone. I haven't yet tested it for accuracy. The problem is that those areas in the rifling catch lead.
The areas in question were not caused by or from fire-lapping. I noticed them about 18 rounds into the process.
If you've ever tried to fire-lap one of Ruger's granite...
You might consider a subscription to www.loaddata.com. There is a mind-boggling amount of published load data there a fella can sort and print it most any way he wishes.
Regarding your question, I searched Load Data for 32-20 data and 13.0 gr. of IMR-4198 with a 100 gr. bullet. Two loads fired...