Rick, concerning your Enfield barrel, I have slugged many an Enfield bore and have yet to find one with a groove diameter smaller than .313" and some have gone as large as .318"!!! If yours does indeed measure .311", it should do fine for a Luger barrel as that is pretty standard for original Lugers in .30 caliber. Newer .30 Luger barrels, including some made in Europe, are running .308" as already pointed out. I have a Benelli B-80 and a Browning Hi-Power in .30 Luger and both are .308" and both are European made. My recent purchase of a P-38 in .30 Luger has the more traditional .310 - .311" groove diameter.
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