I acquired a new-in-box Browning Model 1886 rifle last year and have finally got it out and tried to do some load development. Started with a "1886" level load using 350gr cast bullets and smokeless. With the crescent buttplate that load was a bit too stout and leaded the barrel within 10 rounds. Tried reducing the load to BP levels still using smokeless but the leading persists. The bullets are cast 20:1 so I'm beginning to think this is a jacketed bullet onlygun. The Marlins I had in the past all shot lead well and I have not had a problem with these particular bullets in either my C. Sharps M1874s in 45-110 or 45-90.