Marrakai and Mickey
You might be missing my point about using different bullets in the double rifle.
When hunting deer and pigs the 300gr in the 400 and the 350gr in the 450 No2 give much better results. If you check an older Westley Richards catalogue you will see that they offered a 300 grain bullet in the 450/400 and a 385gr bullet in the 476WR. Other makers offered soft nose split, large lead roundnosed[sometimes called bluenose], lead barely showing, solids, etc.Both methods give a person the ability to match the bullet to the game.

Another factor; Woodleigh's are great bullets, but they come from overseas, thus there may be times that they are not available. Thus in each one of my doubles I have loads, proven loads, with other bullets. I keep a good supply of Woodleighs on hand, but a silly law could make export or import illegal.Also I can practice with other bullets saving the Woodleighs for the real deal.

Same for powders, for example in my 450 No2 I can use IMR 3031, IMR 4831, and RL-15 with equally good results.
In the 450/400 and the 9,3x74R, IMR 4831 and RL-15.
Plus with all the stories about how difficult doubles are to load for I just wanted to see if they were true.

I am simply using my Doubles to their fullest.