I have a stainless Super Blackhawk in 44 Mag. Cylinder throat and bore dimensions are fine. I'm pretty happy with its performance with cast bullets but have wondered if firelapping would make it even better.
Best performance is achieved with water-dropped COWW or isotope lead over 20.0 gr of 2400. Leading is almost non-existent and accuracy is around 3 inches for 12 shots at 25 yards. (Accuracy disclaimer - this is with iron sights and 55 year-old eyes that struggle a little.) Also good is air-cooled range scrap and 8.5 gr of Unique.
Air-cooled COWW or isotope lead over 20.0 gr of 2400 or 10.0 gr of Unique leads the barrel a good bit more and takes awhile to clean out. I'd like to be able to use these loads but the effort to remove the lead afterward is frustrating.
Using pin gages, it appears that I have a slight thread choke of about 0.0004 inches at most. Would firelapping this barrel be expected to improve accuracy, minimize leading with the air-cooled COWW/isotope loads, or both?
Thanks in advance for your responses.