Trying out all the different bullet weights and loads are supposed to be half the fun. Expensive, but half the fun.
Since no two guns,even if similar brands, makes or models, shoot to the same point of aim, a lot of experimentation with ammo may become involved. Fixed sights on mass produced arms can vary greatly as to where POI or POA are concerned.
Fortunately my 85CH shoots to same point of aim practically dead on with 158gr. bullets. These are the preferred bullet weight for my defense loads anyway. +P or standard pressure. Slightly lighter weight bullets shoot a little lower.