Some of the low velocity rounds are still producing a high CUP pressure because of the use of faster burning powders. For 300sav, a Lyman 311291 and SR4759 @ 20grns yields a velocity of 1888fps @ 28,800CUP (Lyman's Cast Bullet Handbook). Just going up to 22.5gns of SR4759 takes it up to 2047fps @ 40,200CUP. I'm sure the variables are endless but I wonder at what pressure does the problem start to occur.
