Point Blank trajectory is normally figured at 5" in a big game rifle, and 2.5" for a varmint round.
You are shooting your rifle at big game. So a 5" point blank range would work just fine for you.
Getting out to 150 with a 5" point blank range is easy. You should be able to do it with a 3" PB range. So set your rifle 3" high at 100 yards then keep moving your target backwards until you are 3" low. That will give your max distance.
Personally I do not like charts. Rarely are they correct. Too many other variable involved. One being the height of the scope off the bore. Only real way to know is to shoot it.
But IMO 3" will work great. And should get you just past 150 yards. Tom.