Dave,the Siamese Mauser action due to it being originally designed for a large rimmed cartridge will accomodate the 45/70 when the bolt face is opened up a bit.The feed rails also have to be opened up due to 45/70 being wider.The magazine is internally slanted which helps feeding rimmed cartridges.I've been looking for one of these for seven years and finally found the RIGHT one for me.
I have more toys coming this week.I ordered a Tokarev pistol chambered for the 7.62X25 cartridge.I had it shipped to the gun shop since I was going to be out of town.It will probably be there when I go in to work today.Ammunition for the Tok's is cheap.I ordered a 1224 round can with the pistol.
A bee up the shorts on a bike could be dangerous.

Stan in SC

The more I listen,the more I hear....and vice versa.

45/70,it's almost a religion.

If you have to take a second shot then you probably shouldn't have taken the first shot.