I posted the write up below on another forum and a fellow there suggested that I post it here. Any additional info on either the cartridge or the maker would be appreciated. Thank you

I am extremely proud of this particular project. Although I have formed brass for quite a few antique firearms I have always had a starting place. I knew the caliber and was able to look up a likely parent case. This one I had to figure out and I still do not know what caliber it actually is.

First the rifle. It was built by Johan Rosler in the 1880's. So far this is all I can find out about him. "Johann Rosler was listed as a gunsmith in Salzburg Austria from the 1870s until the 1890s and was a maker of Fine Rifles, Drillings, and shotguns. He was appointed Buchmiester or Royal Court Maker sometime in the 1880s where he was the sole maker of firearms for the Royal Austrian Court and held this title until the 1890s."

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It is a single shot hunting/stalking rifle chambered in some 11mm caliber. It was sold to me as chambered in .43 Mauser, but it is not. It is finely engraved and in almost mint condition. Even the screw heads are engraved and it has a Greek god face carved horn cap on the pistol grip.

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Double set triggers and a tang sight that completely folds into the tang and out of sight. Bore is pristine.

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As I said it was sold to me as a .43 Mauser and it is not so I had to figure out what it is. Here is my process. I tried to chamber a .43 Mauser round, but the body of the case was too thick to fit. I took a chamber cast and slugged the bore. The groove diameter is .446 which would be consistent with a .43 Mauser. However, the

Congrats on that rifle !! I had seen that rifle when it went at auction and had wondered what happened to it. Am so glad you got it and have been shooting it. Great job. Really a fine looking gun

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Great looking gun, and nice write up! Love to see folks getting old guns shooting again!

What a great old rifle. Real nice to get it shooting. Hoe does the rifle open to load?

Regards,
Powderman

Powderman,
The Lefaucheux lever, of which you can make out the tip at the end of the forearm, rotates to the side which disengages a rotary cam from the locking lugs on the barrel which drops normally. This shotgun image should give you the idea.

I believe I saw your other thread but have forgotten where....imagine that from me.  I believe it bears repeating, "well done!!" on your case forming and load development.  There is not much that is as satisfying as what you did with the fine old rifle.

With the short forearm your lovely rifle has an almost Collath look to it.  

According to what I've learned over the several years of fooling with German rifles the 11.15 X 60R Mauser case head is known as the "A" base Mauser.  As with most former military cartridges several cases were based on it.  Most common probably being the 9 X 47R, 9.5 X 47R and the 10.5 X 47R.  The 9.5 case was for several years a successful Schuetzen cartridge.

I've also learned that what we think of as a tang sight on those old rifles is more than likely a diopter for sharpening the barrel sights.  Something all of us with older eyes have experience.  I have a couple so equipped and on them and many others I've had the privilege to examine there is no way to remove the rear barrel sight from the sight picture of the tang diopter.  When correctly adjusted, if they are adjustable, they work as good as the Merrit optical device or the Lyman diopter.

I have a similar rifle except that it is on a Jones underlever and as with yours sold to me as a cartridge different from what it really is and unknown to me.  I've come to call it the 9.3 X 62R, not to be confused with the 9.3 X 62 smokeless, bottleneck cartridge.  Mine was easier to form than yours as it turned out to be a shorter version of the 9.3 X 72R.  All I had to do was trim the 72R case to 62mm and work up an accurate BP load.  Great fun!

Again, what a lovely old rifle and another well done!!!

Thanks for posting the link, enjoyed it very much. One thing to post pics but the video gives a whole new look at the rifle. Kinda shocked when you said it only weighed about 6 pounds as it looks to be much heavier. Thanks again, Frank