As I have said before you have not just suggested the use of a third fastner action.

You have told people that O/U actions are more suitible for DR's than S/S, encouraged the use of powders that are not recommended by the powder manufacturers themselves. Including god help us Bullseye.

That puts people at risk. It is factually incorrect

I was not using another cartridge as an exemplar regarding double rifles, but as a clearly documented example of the effects of frictional inertia on chamber pressure and I think it will be read as such.

What makes you say that NE loadings are reduced loads in large cases. 113 gns of H4831 fills a 450#2 case to within 3/16 of the neck. What is reduced about that?

If you have built a 500/450 3 1/4 Magnum, then that is a black powder cartridge and you are discussing apples and oranges as far as chamber pressures and the effects of such are concerned. It is half the power of the similar bore NE cartridges.
If you are using smokeless powders to make NFB loads, then indeed they are reduced loadings in a large case, perhaps this is where you are labouring under a misaprehension.

Off to the airport now. Have fun with this whilst I am away.

Regards