I am not sure of the diameter of the bore of your Enfield. It may possibly be a bit larger than a regular rifle in the same .58 caliber. Of that I am not sure. However, the Enfield was designed to shoot hollow base bullets. The hollow base bullets are small enough to easily load and the thin skirt will expand into the rifling when the rifle is fired. The REAL bullets have no hollow base to expand into the rifling so it must fit tightly as you start it into the bore. If the REAL bullets do not engage the rifling tightly, the bullet will not spin peoperly and not be well stabilized in flight. This will give very poor accuracy. I might suggest using a lubricated felt or leather wad between the powder and the REAL bullet to give you a good seal. However, the wad will do no good if the bullet does not engage the rifling properly.
Should the bullet be too small, it may be possible to paper patch it. Again, I am not sure about this. perhaps one of the other participants in this thread will be able to address this idea better.