Marrakai, G'day again.

I've had a look at a previous post of yours which had 2 pic's comparing a Greener and another action. Although it is hard to judge without the actual dimensions the Fausti action appears to be
of slightly heavier construction all over than the Greener. This does not say anything about quality of course and I will leave the final decision up to the gunsmith doing the job. If he believes it to be safe to use in the pressure range you mentioned, I will go ahead with the .500NE
conversion, otherwise I will look at another calibre.

All the best, Ian.