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You must take that bolt with the small lever out before you take the big one.
If you look at pictures of other tennstempel rifles, that small bolt have a slott for a screwdriver.
So I think it was...

Have never seen that lever before,so I don`t know.
Found som pics on the net of the rifle and it is not so plane as I thought.
Beautiful engravings and steel/horn trigger guard + the wedge pin...

They are fantastic rifles. This is a plane rifle,normally they had a lot of engraving both on steel and wood.
Fredrikstad is my home town,a small city in the east of Norway, close to the...

What kind of rifle do you have?
You should take a chamber cast and post a picture here.

304143 12 mm Remington,as we call it here inn Norway.

304142 11,9 HagenLund

11 mm Gasser/ Montenegrino ?

There is a little info here:

https://municion.org/?post_type=product&s=10.75x52+R+Springer

You vil find som information her: https://municion.org/producto/6-x-50-r-scheiring

According to this page : http://www.gualandi.it/docs/tabpolv_2013_eng.pdf
is N3SH and N340 the same powder.

Think AntiqueSledMan nailed it.
222 Rimmed.

You can also get what you want here :https://www.ssfirearms.com/proddetail.asp?prod=SA450

Grafs has them in stock.
https://www.grafs.com/retail/catalog/category/categoryId/778?

ssfirearms also makes them,with top punch.

Are you sure it is danish? As far as i know, they used a 45 cal cartridge.
Norway and Sweden used the 12 mm Remington

http://ssfirearms.com/proddetail.asp?prod=SA450

http://castpics.net/dpl/index.php/the-library/322-how-to-hone-a-size-die

http://ssfirearms.com/proddetail.asp?prod=CC12

http://noebulletmolds.com/NV/index.php?cPath=35_301

Take a look her: https://www.buffaloarms.com/Content.aspx?PAGE=Shell%20Holder%20Chart

http://ssfirearms.com/proddetail.asp?prod=SA450

11 mm French Revolver