I have two Lee Enfields ,a #3 and a #4 not earning their keep and am considering re-barreling to 45-70 . The #4 is the stronger of the two so it may be the one,but I dont know if it's do-able, but I'm sure I read somewhere that it has been done.The rim diameter is almost exactly the same as the bolt head diameter so that is no problem,but is there enough metal left in the rear of the chamber once it's reamed out? Also, what are 45-70 pressures? Trapdoors operate on about 25000 psi,but how high can I reload in a L.E.? To the mid level 1886 Winchester ,I don't know that pressure , or the top level Ruger #1 pressure,don't know that one either, but I'm pretty sure the #3 L.E. works on 44000 psi and the#4 must be higher as they're routinely rebarreled to 7.62 Nato, and that's about 50000 psi. Any experience with this conversion out there, I'd be happy to know whatyou think. Oh,I doubt it will feed properly, so it may be a single shot.