You can always increase shell power (higher payload and/or higher velocity) if you are willing to use higher pressure. By the same token, you can get there sooner if you go faster - - - maybe. I can think a of many reasons not to exceed SAAMI or CIP pressures. There is always someone who thinks he needs something crew-served where hand-held is called for. Much like the hillbilly theory of luberication - enough is good, more is better, and too much is perfect.