I used a 450 grain Barnes TSX for the first shot followed by 450 grain North Fork flat point solids for the remaining three. Handloaded to 2250 fps in a .458 Winchester.

There is some opinion that with the Barnes TSX you don't need any solids for follow on shots on buffalo. I disagree.

One of the reasons why softs are recommended for the first shot is that a solid might pass through and hit an unseen buff on the other side. I think the TSX would pass through on a side shot unless it hit bone.