Sorry to disagree, but advent of the 450/400 3 1/4" nor the 450/400NE 3" had nothing to do with the ban on the 450 diameter being oulawed in India, and the Sudan. That ban was in 1909, and the 450/400 3 1/4"in it's, blk pwdr form was introduced in 1880, by Kynoch,and was converted to smokeless in the mid 1890s. The 450/400NE 3 " Was introduced by Jeffery in 1896 and was never available in anything other than smokeless powder version.shooter93 said:The 450/400 came about when military calibers were banned for civilan use in some countries so the 450 was necked down to 400. In the nitro version it became the standard for all 40 calibers...ie...404 jeffery etc. The 3-1/4 versions tend to run 411 diameter and the 3 inch version 408.It has high sectional density bullets and makes it a great dangerous game caliber with out un-managable recoil. Brass is readily available and so are bullets so it's not to expensive to reload, i load for mine all the time.