Jerry,
Did you mic the bore?

I feel sure a .357/.358 bullet is what you need.

If it is a true 9.3 the .357 bullet should fall through the barrel.

If you have an RWS 9.3x72R case, size the neck in a tapered 357 carbide die and let us know what happens.

Mike


USAF RET 1971-95 [Linked Image from jpgbox.com]