41 Long Colt isn't one of the easy to reload calibers. You can find some specific information at
http://www.sixgunner.com/omeara/41longcolt.htm
and "HarryO" at the sixgunner message board has been working with this caliber see
http://disc.server.com/discussion.cg...&article=99199
He has been working with fire-forming 41 Long cases from 357 cases.