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The 93 grain standard bullet for the 30 Mauser (nominal diameter 0.3085 from at least one manufacturer) is another candidate. If you check jacketed 30 calibre bullets you will see that quite a number run this large.
Without endorsing the practice, I'd remind all that during the golden age of the Springfield millions of .32 calibre (.311-.312) jacketed pistol rounds were fired thru 30 calibre (.308) barrels. The bullet is swaged down to barrel diameter as it enters the bore, it does not go thru the barrel creating a traveling bulge like a rat going through a snakes' digestive tract. If you must do this, do it safely. Use very light loads of powders designed for reduced loads such as IMR 4759 or Accurate XMP 5744. Insure that the powder stays in the back of the case, and do not try for high velocity. These bullets will not stand high velocity even if the pressures you get are stable and low.
As pointed out above, the use of a sabot is a much more practical solution if you want bullet speed to be high. Bob
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