Remington RB Carbine need help bore .514

[ehull]

Jim, What is the caliber? There was a period 1869-70 when Remington made some of these in a .50RF that is bigger than a .50 Spencer.
What are the tang markings? To match the breech block type it should be two lines ending in 1866.
Also, is the buttplate interchangeable with a US rifle musket or is it the narrower Remington type.

[Jim C]

Jim, What is the caliber? There was a period 1869-70 when Remington made some of these in a .50RF that is bigger than a .50 Spencer.
What are the tang markings? To match the breech block type it should be two lines ending in 1866.
Also, is the buttplate interchangeable with a US rifle musket or is it the narrower Remington type.

The butt plate is 1 3/8 at top and 1 1/2 at bottom. I don't have the right tool to measure but end of barrel opening is right at a .514 the chamber measures a little over 1 1/2 inch long before riflings began it is longer than a 56-50 spencer which I have one. I have included a photo of patent dates on tang

[Dick Hosmer]

Searched Hoyem Vol. 1 (usually most helpful) with no definitive results, other than to assume the intended round is something from the post-war developmental/experimental morass. Chamber length would appear to point to a RF version of what would ultimately become the .50-45 Navy round. I'm thinking the arm, which looks to my untutored eye (don't own such a carbine) very much like a regular 1867 Navy, might even be unique in that chambering. That's about the extent of my thoughts - I yield to my friend Ed Hull as the early Remington authority!

[Jim C]

Maybe someone can guess the caliber from this photo I am looking for someone local to case chamber thanks for all the help

[Jim C]

There was a guy at local gun shop mic. The end of barrel .514 also he looked at chamber the outer measurement of rim would be .679

[JReed]

My recomendation would be to pick up some Cerosafe do a chamber cast get a dial caliper and share the dimensions. It will be the only sure fire way of figuring out what you have.

[JWLASER]

I am the current owner of this rifle, any suggestion on what it might be?

[ehull]

Please read all the discussion on this thread. It is a standard remington made carbine, circa 1870. The only open question is the cartridge it uses.