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I traded into a pretty rifle chambered in 404 BJ express - the bullet diameter is .411. I have been looking for any load data I can find on it, some came with the ammo - the problem is that the loads are worked up for IMR 4320. IMR 4320 was discontinued a few years go. Best I can tell the 404 BJ Express was created back in the late 50's since it uses resized 458 win mag or cut down 375H&H. The rifle is a 1951 FN mauser. The bore diameter of the 416 Taylor is only .005 difference in size. I am wondering if it would be ok to use the loading data from the 416 Taylor for this effort. The cases dimensions for the taylor and mine are almost identical except for the bullet diameter. I simply need a starting point. The cartridge is not even in the book "Cartridges of the world" Any thoughts or info would be greatly appreciated.