I have thought about this some , I have been known to push the envolpe a little . But if you have 1 case with a defect with these hot loads you mayhave a case head seperation blown primed or worse. I have seen out of my gun a load that was not showing any case head expansion , show high presure with 30 degree of temp rise. Also the next lot of primers may be a "little" hoter or the next jug of powder may burn a "little" faster and create a presure problem. Is your gun or your and others standing close safty worth the few extra fps. IMO the only shurly safe way to increase speed is to increase usable case capasity and with a 40 gr. bullet you can't seat it out far enough to get you there safly