Enfield No 4 British manufacture

Got a pretty nice No 4 mk 1 of the M shooters board a couple of weeks ago. Spent some time and cleaned it up and am fairly happy with it. Appears to be a Malty bolt and just needed an extractor spring. Serial # is too faded to read so no clue as to original Manufacturer although it does not appear (from what I can see) to match. I slugged the barrel and it comes out .308 on the lands Isn't that small for an Enfield? are cooper jacketed .311 projectiles safe for that size? I do cast also but nothing that small. Wanted to get your opinions in this. Thanks...

Actually, the lands are nominally 0.303" dia., so your bore may run on the large size. Groove dia. is the question. At any rate, if the weapon is firable, 0.311" bullets will be OK, if not ideal.

30-06, 30-40, 30-30, 308 winchester, etc. run a nominal 0.300" dia. across the lands. Groove dia. about 0.308".
.303" SAA, 7,65 Argentine/Belgian, 7,7 Japanese, Soviet 7,672x54R, 7,62x39, etc. tend to run larger, but not all exactly the same.
7.35 Italian is about the only 0.300" groove dia. bore and bullet that springs to mind.

Forgive me I had my terminology off, it's the grooves that are measuring .308, not the lands. I got the two mixed up. Also I when I tried to clean the barrel absolutely no copper fouling came out. Bright and shiny bore.