I don't know if there is a magic weight for all guns. I was dissapointed with my first try of my .243 Handi Rifle. The 75 gr would barely shoot an inch and a half off the bench, even after burning up a hundred rounds of different powders/loads and trying different shooting styles suggested by the good folk on the Greybeard NEF forum. I bought a box of 70 gr. They shoot fine. I will be trying the 100 gr next.
My 7-30 Contender likes 120s and 140s but hates 130s. Go figure!
Keep working at it.
mike