According to my Lee Second Edition manual, Titegroup CUP Pressure (if using max load) of 10.0 gr is 38,400. Max load of IMR 4227 in this book is 22.0c @33,300.00.
According to this book the highest pressures (at max loads) come from Accur 2,5, 9 and IMR 700X where all are 40,000 or just...