Hmmmm.....avoid IMR4831. Does this apply to the 450-400 3" modern made double? I see lots of people reference using it. Asking for a friend.
Do what you want, but it kicks like a mule and if the five typical powders attempted to find a double rifle regulation load it is dead last.
In a 470 NE it (4831) produces over 100lbs of recoil and 3031 produces around 60lbs. The only reason people use it is that it fills the case, a very stupid requirement solved with many wad options.