I have a Vanguard in 30-06.
It was very tight in the synthetic stock when I got it.
Decided to try it anyway...not great, it shot a lot of flyers.
So I took the stock off and hogged out the forend and the sides
till I could slip a strip of paper right down to the receiver.
Voila! sub-moa consistently now, and with almost anything I
have tried in it.
Not saying it will fix yours, but it sure worked on mine.
FWIW, I have the identical rifle in 270, and it shoots just fine without
any mods.
Regards, Eagleye.