This conversion cannot be done on a Lee-Enfield action because the rim diameter of the .45/70 is .030" larger than the diameter of the bolt. The P14, however, does make a very nice conversion to .45/70 and I have done several of them. The P14 action is quite strong, allowing the old .45/70 can be safely cranked up to velocities that approach the .458 Win Mag.
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