Best way I can think of to get the fastest, safe pressure, loads from a cartridge is to use a much longer barrel. For example, a 150 grain factory round from a .308 Win. 22" factory barrel will leave at about 2700 fps. With a 30 inch barrel, it would leave over 2900 fps.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master