I've shot a bunch of these from Montana Bullet Works (15 BHN-Lyman #2 according to the box). Picture of 50 yard group from my 4 1/4" FA M97 (Fiber Optic front and old eyes):
In the FA97, you either have to trim the cases, or crimp over the front drive band -- I crimp over the drive band.
I've shot these (crimped over front drive band) in USFA Flattop Target, Ruger New Vaquero, and S&W 625.
The USFA likes the load.
The Ruger doesn't shoot anything better than 2".
The 625 has .454 grove and .451 throats, but still does about 2 1/2" at 25 yds.
Paul