WRONG...you couldn't be more wrong if you tried! Brass is NOT brass..it is so varied that it's not even funny...one load in one brand may cause pressure problems gallore in another brand. The internal and external thicknesses are usually as different as night and day....there sometimes are differences in one brand of brass from the same company with different lot numbers. As a competition/benchrest shooter for many years, I've certainly seen the results of such a thought and it is dead wrong to think that ALL BRASS is the SAME..it is "NOT".