I think it is a fairly modern handcast bullet and from the comparison to the size of the dime it looks to be about .30 caliber. One of my shooting buddies casts, sizes and lubricates bullets that look similar for use in his .03 Springfield and he has won a few matches shooting them at reduced velocities. Kenley is correct about needing measurements. About 6 to 9 oz. doesn't mean a thing to anyone who knows bullets. Monty