I bought a Remington rolling block today, someone traded it in and I was able to buy it very cheaply.

Someone put a ton of work into carving a custom stock and re-barrelling it.

It's in 7mm Mauser.

It's old enough that there is no model name on it or serial.

How strong are these? Can I shoot regular 7x57 level loads?

If I rebarrel it, are there limits?

The stamp says Remington arms Ilion, but the date is unclear. Maybe 1891?

Any help is appreciated