What powder are you using? I have a Ruger M77 I bought new in the mid 70's. Worked up a load with H4831 that has been very accurate all these years. I have shot the Speer 175 gr. Mag Tip exclusively. H4831 has changed a couple times over the 40 years and I've reduced the charge accordingly. The 7mm likes to be pushed.
Kurt
As the late Turner Kirkland was fond of saying, "If you want good oats, you have to pay the price. If you'll take oats that have already been through the horse, those come cheaper."