Well, never shot hollow-base pistol bullets in a .40, but I HAVE shot sabotted .40 caliber pistol bullets in a T/C .45 caliber Hawken rifle. My best load is seven grains of 3f Old Eynsford topped by 70 grains of Triple 7. I've used both JHP and LSWC bullets to good effect on milk jugs. I would think that a similar load should work well for you. I gotta ask though; why hollow base bullets? Other than for the purpose of historical accuracy with some guns, I can see no real advantage in them. Minnie balls worked, but they eventually got almost abandoned over the decades since the Civil War.