Dutch,
<br>
<br> I think I agree with you on the time component. Note when fireforming Ackley Imp. brass that if there isn't sufficient pressure generated, the case will not be sharply defined by the chamber walls. I must assume the pressure was above the yield strength of brass (as most of the forming took place) but the pressure wasn't above the yield strength long enough for the brass to completely form. The higher the pressure, the shorter time required to comletely form the brass. The simple solution is increasing the powder charge which increases the pressure. The brass completely forms (with good definition) in one firing.
<br>
<br>HogWild
