My #1 is a 1-B that Douglas rebarreled to .405 with a .411" barrel in 12" twist. I can load the Woodleigh 400gr bullet crimped in the cannelure without problems. Using a tad more Varget than the Hodgdon's online data lists for that bullet I get right at 2,050fps and groups just under an inch at 100 yards.

Biggest animal I killed was a Blue Wildebeest and the bullet sailed right thru, I've also shot a couple of whitetail deer with no drama.

hth

Rick