Thanks Guy's.
I think Wapiti rod is right about being a die problem.
There is something about FC brass that my die just will not size properly.
I maybe ordering new dies soon.
BTW, I own two different .41's. A total titanium 6.5" Taurus Tracker and a S&W 657 pro center.
Of the two the Taurus has a tighter chamber, it does not matter which gun the federal factory ammo is shot out of the results are the same.
New dies may take care of this.
Elk season is not far off so I need to get going.
Thanks again Guy's.