I agree with you. That is what my copy shows also.

This is where I am becoming totally confused with so many conflicting pieces of information.

The crux of it is this, I have scrimped and saved and finally after 24 years of longing have booked a trip to Africa. Now I dont need a double, but I want to use one for what may be the only trip I am able to take. I cannot afford even an old double so I will build one. Not the first gun I have built by any means.
I am not too concerned as I will use .450 No,2 in a quite pretty, modern Spanish action I have forund that has 3 1/2 inch chambers 1350 bar service pressure and by design has the facility to dicharge both barrels simultainously( though hevens knows why you would wish to (1750 grains of shot at 1400fps ouch).
If that isent enough action then goodness knows what is?
But with a project that has a 20,00 psi bomb 12 inches from my face I would like as much empirical data as I can get.

It is apparent that many people have built doubles on shotgun actions and they work from OK-very well, but are they just using the safety margins that are built into any gun to acchieve that and constantly exceeding the design criteria for that action. On the face of it Ellis Brown is using the proof pressure to secure a new service pressure, with due deference to him, that is like firing any gun with proof loads constantly, that isent safe or sane. Constantly appraching the elastic strain margin of any piece of steel will eventually lead to stress induced failure from work embrittlement.

I got A squares book today and they absolutly do not recommend fillers, however all the loads on this site talk about RL15 and filler, whereas they use RL22. Now you guys shoot these rifles all the time, but they have all the lab facilities, whom should I believe?

Do you know of any data where somebody has tested a double action to destruction to assertain where the limits are, and do barrels fail before actions. All the horror stories I have read refer to the failures of barrels, I have not read of a failed action?

Regards