One of the guys at work today was telling me about a local auction house that had quite a few guns going up tonight. One of the ones listed was a Remington rolling block carbine, but was listed as a .38 caliber. He did get a chance to check it out, although he couldn't handle it. From what he saw, it appeared to be around a 30 caliber ( from eyeballing it anyway ) and the breech looked as though it was for a rimless cartridge. That's what was throwing us off.....the only thing I could find while hunting on the net was that it might be an Argentine cavalry carbine....as they had some coverted to 7x57......but that's the closest I could come up with. Any of you guys have any ideas?
He was thinking of bidding on it tonight, I'll find out tomorrow if he got it or not. Hopefully he will have it....

Remington made a HUGE variety of Rolling Block firearms in the 19th Century.
In fact, the most common and widely used cartridge military rifle of that period was the Remington.

Remington did make a Model 1902 Rolling Block in 7X57mm Mauser for many countries, including Mexico.
This would be a rimless chambering.
Without seeing the rifle, I can't be sure about what caliber it actually is.

It's probably a 38-55.