In The Redwood Stumper, 2009, an author named "Waterman" wrote about the 401 Winchester. There is a very unscientific comparison between the .351 and .401 cartridges on a remnant chimney out in the woods. The .351 shattered the bricks, while the .401 vaporized them. It impressed the author. I got one of these last year and finally got a chance to look at it more closely (we had a baby). I need to shoot this thing! I've shot the .351 and I'm a big fan - I've got 4 - but the .401 is intriguing. I can imagine it being hell on car doors and bullet-proof vests. I have collected some old ( its all old) ammo too but probably too valuable and old to shoot.