If you haven't bought the Magnum Research BFR in .45-70 yet you might think about it for a while longer. I had one, key being had, and while the recoil was not abusive as some would have you believe, it's just extremely impractical. It weighs a ton, as do the shells if your hiking with one. In a belt holster it catches on everything, being so long, and in a shoulder holster I could hardly lift straight up far enough to clear the rig. It's fun at the range, and that's about it. Get a .45 long colt or 44 magnum and you'll have a lot more fun with either. I'm pretty physically fit but holding that monster up to fire accurately wears you out. I also have the Henry H010 lever in .45-70. Love it. Nice recoil pad, very comfortable to shoot.
As I mentioned I put it on consignment at my LGS and it was there for quite awhile before someone bought it. He, by the way, put a cylinder through it and put it back on consignment at the LGS where it may still be. There's a reason your friend wants to sell his!