I have been trying to standardize on one bullet weight for my FA 83 in 475 Linebaugh. For my Texas Hill Country hunting of deer and hogs, I think I found one in Leadheads 355 grain LFNGC. I know it is less than your 400 grain criteria, but since the bullet isn't going to expand, you shouldn't need a lot of weight/SD to punch through your porkers. The nose length is about .380 and so is the meplat. I'm using AA9 and moving it out at just under 1400 fps. Very accurate, but still haven't used it on flesh yet. Too many other things to test! Just giving you my thoughts on the matter. I expect a full write up on whatever you choose.