The 47E is and old model with 2,75 chamber and proof at 850bar (using pressure). When it has been sent back to a factory for chock changes they make a steel shot proof 1050bar. Proof cardtridge is 30% higher loaded then that.
Eagle with small N below is nito proof 850 bar. Steel proof additionally has a sword lily stamp )max using pressure 1050 bar.
For the 3" it is accordingly but for 1050 standard and steel 1260 bar.
We can buy here cartridges 12 2,75" with pressure 1050 bar what is then especially written on the hull. Same for 16 and 28ga.
The factroy told me that it is no problem to use high pressure loads. The only what must be looked at is that shell lenght is same or shorter then indicated in the barrel.