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With everyone's help, I bought some 8.15x46R dies, cut down some 30-30 cases and bought some over-sized lead 30-30 bullets. I strapped this gun to a stool and rigged up a trigger pull from phone...

Re-slugged the bore and also did a cast 3/4 of an inch down the barrel, .316.
My chamber casting measurements are: Base .424. Neck is .3495. Length is the only thing I could not nail, but I came...

it would appear that both the extractor and diameter of the bolt face would have to be
altered to fit the 8.15x46R case head, you might check your bolt ?

So I tool the bolt and the Remington 8mm...

Here is the latest casting of the chamber. I had a hard time as if I went to deep, it would not come out. I put a mark buy what appears to be the top of the casting as the rifling starts just about...

Some of the pictures of the cast chamber. I also removed the barrel with very little trouble.
Some measurements of the casting -VS- 8mm cartridge....
BASE Cast .421 ...

I did try the 1/4 rod on a bolt that was threaded into the casing, or so I hope it is a casing, and tapped on it. There is a rough feel to the bottom of the chamber area. A broken cartridge?? I...

I measured the 8mm Remington Mauser round at .467 to .427 at the shoulder. I used a tap, not sure of the size as it is not front of me, about .433 I believe. I only went in about 1/2 inch and tried...

I have to head back to work for a few days. The casting material should be here when I get back and will attempt to see if I can free the casing from the barrel. Will post if I am successful and...

Looking at this picture, from the chamber forward. I have a notch on the right side of the chamber(the picture is upside down) and the rest of the area is raised like a rimmed cartridge. The 8mm is...

I pulled the gun down and here are the markings on the barrel. I could not believe how clean the metal was under the heat shroud! It says:

7.7m/m
46
3.30
679

About 3/4 inch above that is...

I ordered the casting material today. When I tried the 7.62x39 casing, it went in about an inch and would not go further. You can see a ring around about half of it about 1 inch down where it...

I took a piece of lead and tapped it into the end of the barrel. It measured .311 to .313. I also used a ball gauge, about 4 inches in, with the same results. I measure the 8mm Remington rounds...

Looking at the chamber with the bore scope, we thought the sharp transition in the barrel was a lining, but it goes all the way to the end and is solid, but it is just that, a sharp stop mark. The...

More pictures.....Lyle

Here are some pictures of the gun. The date is 1890, I think I put 1891 in another post and you can see the "S" but under the "S" is also a CE. The serial number is 1540 with a letter "P" under the...

It worked...the pictures I mean......Lyle

Is there a way to insert a picture? I used a bore scope and took a picture with my iphone. The bore looks OK. When magnified with the cylinder bore scope, you could see a lot of scratches that I...

Just got home and read the last 2 replies. I will pull the bolt and use an engine bore scope and light to see if there is something in there blocking the chamber.

I am looking for ammo for this WW2 war prize my uncle sent home in 41. It has the "S" markings that it was converted, but the barrel slugged was .311. It DOES NOT have the cut out for the spritzer...