Odd 45-70 Blank (maybe?)

Hello, i have an odd 45-70 that looks like a Blank or Gallery load. It is light weight and someone wrote Rabbith Pat. on the the side of the case. The case is brass with a W.R.A.Co 45-70 headstamp. Thanks in Advance

The Rabbeth Patent was for a small caliber lead bullet encased in a wooden sabot.