According to Graeme Wright the 470 nitro produces 16tpsi, the 375F 18tpsa and the 375H&H 20tpsi. Using a reduced pressure powder (H414) and a reduced load 235g@2500fps I reckon my loads are in the 18tpsi range. And giving that the gun is built like a brick shit house, I doubt I have much to worry about.

The action has two engagements(?) under the barrel and the greener cross bolt plus the side clips (I agree they are pretty)

Sorry to say, but I'm not familiar with the terms bite, dolls head.