Check the old Lyman Cast Bullet book for old offerings. Once you find a bullet the shape and weight you desire, you can talk to the custom mold makers about making a mold for you. There are a variety of weighs shown from about 85 grains up to 130. I would think your bullet would be small, and round nosed, but I am not familiar with that caliber for that gun.
There are all kinds of .30, and .32 caliber bullets available in molds, and they can be sized to fit your barrel. As with all MLers, you need to determine the bore diameter and groove diameter to the thousandth of the inch before you can make a decision on what size ball or bullet the gun will fire.