I don't know what you are supposed to do, but I hunt with a double most often, and I carry the rifle loaded with a soft in the right barrel, and a solid in the left. Additionally, I carry two solids between the fingers of my left hand,in the final stages of a stalk, or did, till I had a lot of cancer surgery on my left hand. On my belt in front all are solids. Two of them in a little gadgit called a "DOUBLE DUTY" made by Galco! This little gadgit when flipped open drops two cartridges, primer down in your left hand! So I have a soft for the first shot, if I get a standing shot, or if I stumble onto a lion in the bush, at close range. All the next 5 shots will be solids! Now I don't hunt elephant, but most times I will be hunting Buffalo. If I were hunting ele, then all would be solids! But I am a client hunter, that can't afford to hunt Elephant, so it doesn't matter. When hunting buffalo, I want my PH to use solids in his double,because I don't want him to fire his rifle, unless I'm about to get stomped, or the Buff is getting away into the weeds.

All that is a long winded way of saying the soft & solid is proper for the client with a double, but not for a PH! Just my $.02!