You'll want to read up on loading 45-70 there are 3 different levels of loads for the 45-70
1 loads for trapdoor springfields
2 loads for lever action rifles
3 loads for falling block rifles (Sharps, Ruger no1's)
loads for the trap door can be used in any of the three, loads for the lever actions or the falling blocks cannot be used in a trap door,The action can't take it, it'll blow,likewise,A lot of loads for falling block rifles can't be used in lever action rifles same reason they can't handle it,I'm not sure where your Enfield would fit in here, I figure in the lever action area, Like I said, I'd read up a little bit on it...I have a reproduction Winchester M1886 in 45-70,Accurate rifle, I've been shooting 405 gr cast lead slugs through it,lots of fun.. Got a loadbook from midway and this is where I found all this out,I don't think the enfield action could handle alot of the falling block loads, due to the bolt lugs being where they are, on the rear of the bolt...Maybe get yourself a loadbook from midway..lots of loads and info in them...Alot of the people using falling block rifles use black powder, I don't, mainly because of the cleaning needed, and that would be a real pain with a lever action gun, a Sharps can be easily taken apart for cleaning, not so with a lever action, so I use smokeless powder,Works very well, reloading is very easy, 45-70 is like a big pistol cartridge, (you still have to lube the cases)but everything else is like a handgun round, Bell the cases, load powder, seat the bullet, crimp, not hard at all,Some loads with smokeless you should use polyester wadding (polyester batting,bought at fabric store,) all this does is keep the powder down on the primer,and is easy to do 45-70 is a fun gun, would make a excellent hunting rifle if ranges are'nt too long..100-200yds,max, One just has to be a little more careful to match up the load with the rifle it's going to be used in...