Yes, there's lever guns you can aquire out there in 45-70 like used Marlins, Chiappa makes them, so does Winchester as well in their 1886. Henry makes them and you can find good single shots from Browning, C. Sharps, Shiloh Sharp's, and used Ruger No1.
The Browning BLR in 450 is a nice rifle. I've got one and it's a fine rifle. Wish I came to know the BLR much earlier
