For a target load, I am using 240 Gr SWC, flat base, casted from wheel weights, 8.0 grains of Unique, lubed with lyman lube, sized .430 in my 629's, a 6 inch, a 4 inch and a Mountain gun.

No leading in sight, accuracy is excellent

Here is a link to Leadhead Bullets. Scroll down to the .45LC bullets. You will see diameters from .452-.454 You could order 100 of each and see how they do.

http://www.proshootpro.com/

Their 230gr Keith shoots well in my S&W .41s.