Try this with a 9.3 - Hint: they don't make 0.366" dia pistol bullets.
9mm Makarov is .365". It is close enough to shoot well in my 9.3 bore. Moreover, one can always seat a Mak JHP backwards if the 9.3 bore is a little too generous. The HP becomes a miniball type skirt. .366 meplat is a wicked wad cutter. May not feed from the magazine though.
Learned something new . . . What powder/velocity? W-231 is my powder of choice with pistol bullets in the Whelen at around 1,200 fps.
