depends on what you realistically expect to encounter.
for police work a mid to heavy weight 165-180 gr. would be best.
for just private citizen ccw a 135-140 gr. would give you plenty of punch without over penetration potential...
all depends on what your real or percieved needs are.
with Sarah Jane, Leela, Romana, Nyssa, and Tegan.
Facts are no match against enthusiasm and ignorance...