What are you disagreeing with.?

Call Purdey or H+H and ask them which of their DR are designed with handloaders in mind.

Gunmakers regulate for one load, all be it that the cartridge manufacturer may have tweaked that load in the first place to make solids and softs shoot the same. Are you telling me I am wrong in this statment?

That it is a lot of messing around.? Well clearly for the poster on the other thread it was, he couldent get a load he was happy with.
Respectfully, I did not say it was not possible only that it was not and should not be necessary. If one wishes to do so for fun then more power to you. From the tone of the poster on the other thread he was not enjoying the process and just wanted to shoot his new rifle with decent accuracy.

Why would one wish to have several loads for a double rifle. It is a tool designed to kill things with. If one load works, then the time and money is better spent using it for its purpose. If one has a 450 and wants the balistics of a 375, then go buy a 375.

I dont see the cost of ammo as a factor. One can go to the auction and buy 470, 450 etc for $3-4 a pop, one cannot buy the heads and powder, wads, primers ,brass etc for that.

Regards