Thank you all for your ansvers.

Don't think ill buy a Hein, ill rather support Finnish
gunsmiths propably Mr. Jalonen if any.

Anyway my purpose is build a 500J from old mauser if possible?? Im not considering to buy a new, not even action. If i´d byu a new one it would be a new Mauser 505Gibs.

Mehul, thank you for your advice!

I did found something of Boha thru google, but not enough
but i think his guns were made here http://www.bjorkholm.fi/ pick vapenbyggen. Mr. Björkholm is at the moment only Finnish gunsmith specialiced in "elefant guns"

as we say here.