In the calculations I used ether the max cartridge diameter or the chamber diameter, what ever one was largest. I did this to reflect The kind of pressure that the bolt would experience with a case head separation. All of the calculations are setup in that manner. Actual bolt thrust will be less given the area on the inside of the cartridgeis less than what I am using, the drag between the case walls and the chamber also will reduce the force on the bolt.
Based off of the calculations the 7.62x39 has the most Bolt force of the Saigas with the standard trunnion.
Of the bulged trunnion the 7.62x51 has the larger bolt thrust even thought he 9x53R has a larger case head.
The 6.5x52 Carcano is actually under the amount of force of all of the standard trunnion Saiga calibers, and the 6.5x54M-Sch. is a little over the 7.62x39 for force on the bolt.
The 7.62x54r is close but a little over the force of the 7.62x51. Note the PSL does not have any proof marks on it so we can't hold it to up in comparison. Though the VEPR 308 does have the proof marks and it is using the RPK74 trunnion and bolt. As far as I have found in my research it was the standard rpk74 trunnion and standard AK74 stile bolt. The AK74 bolt does have thicker lugs than the AKM bolt though.
As I said before by reading this you take responsibility for any repercussions of the actions you take based on this information. I haven't rigorously checked over my calculations so I would recommend doing the calculations yourself if you are even thinking of doing anything with with the information I have posted. If anyone finds any errors please alert me to them.