My understanding of the tropical loadings is that they were intended to give full velocity in the heat of Africa, ie 2125fps at say 95*. Cordite was very temperature sensative from what I've read.

On the wound channel from soft bullets, well, thats great for small game. When it comes to bigger stuff its all about penetration, at least in my view. You need the heavy and harder bullets for that. A 400 calibre solid that gets where it needs to go is going to be better than a soft which doesn't. Velocity will get the solid where it needs to go. Weight will get a good soft there too. 400 or 410 grains is the weight that made the 400's reputation. 2125fps is the velocity that did the same. Short on either and you're just experimenting.

JPK