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.308 bullets will work best in these rifles. It would also be wise to do a chamber cast to see the true bore of your rifle. It might be worn away enough to shoot surplus without excessive pressure.
 

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Does the 'F' indicate a distance between the mouth of a cartridge and the rifling, the 'jump, or throat? Cant remember.........
 

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The F indicates the angle at the neck of the casing. In this regard, the D varies only slightly from the F specification. I have three M27's that are F marked but not D and have never had any problem using light ball surplus ammo. The bore diameter of a new condition M27 barrel is .3095 so .311 surplus bullets will do just fine and won't cause any high pressure.
 

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FWIW, my M27 is marked both 'F' and 'D'.
 
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