I use the RCBS 162 gr SWC over a stout load of H-110/296 cast real hard. I size to the slugged groove diameter. I am not concerned with expansion on handgun bullets, I want real accuracy with a handgun. You need a bullet and a load that will hold 1" at 50, at least, off the bench. If the gun can not hold to the accuracy needed, get a different gun, that will do so.

“To expect defeat is nine-tenths of defeat itself. It becomes a self-fulfilling prophecy. It is best to plan for all eventualities then believe in success, and only cross the failure bridge if you come to it."
Francis Marion - The Swamp Fox