Thanks.

Unfortunately it is only by metallurgical analysis or confirmation from the factory that can verify this for sure. Of course, based on your description of the factory operations, maybe the latter isn't of any value, either!

I do see your point. I'm just concerned somebody doesn't make an assumption that gets them into trouble after incurring a lot of expense and effort. I do not believe there are any obvious differences between the various strengths of NEF guns {not sure about markings}, so I don't think a visual assessment f them would be helpful, and thought maybe the same applied to the Baikals.

As you say, the Baikal guns have a very good reputation for strength.

HERE is a case where proof law would be of service if it required the marking of an action for a certain pressure limit.