I have, but it has been decades. I don't recall the exact modifications I made to the feed lips and follower, but they both required a little attention. I wish I had better details for you. I do recall the 444 Marlin was much easier, no doubt due to the smaller rim diameter.
The 410 Mauser will (or should) have modifications closer to those of the 444 Marlin conversion since the rims are close in diameter. But it should give you a good idea on what to expect on the 45/70, just on a smaller scale.