Take a look at what just happend You had to move up how far.
What I have found is dont go by any chart.
150 for the most part will not shoot the same as 165s.Close but no candy bar!!!!!!
If you shot a 150gr win pp and a 150gr rem cl in your rifle the POI may not be the same. Bullet drop will change Even if thay both left the end of the barrle at 2850fps when the bullet gets to 100 200 and 300 the Droop will not be the same. The bullet may also be dead on OR hit off to one side,
THE BEST Thing is take what ever 150,165,180, your going to shoot and start at 100 and move out and find out whats going on.To make it more fun ya may find that each brand of bullet may or will have a mind of its own thats the fun part. good luck