Perhaps I would have been more accurate saying a SAAMI compliant load rather than a Trapdoor load.
The Contender pistol is chambered for the 44 Remington Magnum which has a SAAMI pressure specification of 36,000 psi. The Contender rifle comes in the 375 JDJ which is routinely loaded to 40,000 psi.
And you are trying to convince us that loading the 45-70 at 28,000 psi is going to hurt a Thompson Contender pistol? If one has a 44 Rem Mag Contender pistol I believe they can interchange the barrel with another Contender pistol barrel. So, the Contender pistol frame will somehow disintegrate shooting 28,000 psi 45-70 loads with the 45-70 Contender barrel, when previously it was digesting 36,000 psi 44 Rem Mag loads with the 44 Rem Mag barrel without incident?
I understand being cautious, but not being irrational.