A 9.3 case will stick out of a 9x72 chamber about as much as you described. Have you resized to 9x72 to try for a good fit. Frankly, I like the bullet selection in .358 a lot better than the 9.3's anyhow. I am with Mouer on reaming to 9x72 if it is an odd straight walled case that mics out enough metal to get away with it. the 9x72 is fairly low pressure. Be careful. Steve