A company called Zastava Arms makes a modern line of mauser design rifles in 7mm mauser but I do not know who imports them.
7X57 is still a major player in Europe and many other parts of the world, just not so much here in the USA where the 30-06 overshadows everything else. If you really have a hankering for a 7X57, you can buy a very fine rifle in that caliber from one of the European makers if you don't mind mortgaging your home for it.In reality the 7X57 never caught on. No significant army ever used it and it's very hard to find ammo for it anywhere.
A company called Zastava Arms makes a modern line of mauser design rifles in 7mm mauser but I do not know who imports them.
Usually the people who are worried about follow up shots are the ones who quite regularly miss with their first shot.