Check the related link at the bottom. There were several variants of the Mauser rifle, and I can't give a link to a specific article without knowing which model you have. There's a menu on the left hand side which has articles for different variants of the Mauser (and several other types of rifles).
The Mauser es340b was a single shot .22 long rifle. It was made too look and feel like a Mauser 98K. It is not a sniper rifle. It is a target rifle.
I highly recommend you have a gunsmith show you.
Best left to a Mauser trained gunsmith
Steve Kehaya has written: 'The Swedish Mauser rifle' -- subject(s): Mauser rifle, Rifles
This rifle (Mauser Model 2000) is worth $350 in excellent condition.
It means the action of the rifle was made by Mauser or copied by someone.
Mauser
A Mauser!
More information is necessary. If the rifle has a 4-lug bolt head, it is the same as a Mossberg 810. Research the 810 for info on this rifle. It may be made on FN Mauser 98 actions, in which case it will be like any other Mauser 98 sporter. Otherwise, it will be German made by Heym and is either the same as a Mauser 2000 or Mauser 3000 action. The scope, on the other hand, is almost impossible to describe these days. It will likely have Japanese optics.
There is a model 1895.
7x57mm
Yes.