In a similar boat with the same model gun (different caliber). What is appropriate in lbs for each of the screws on the stock?
Yeah it’s a feel thing.
I have several forms of 3 screw M70’s. Not saying this is right, but here is what I do…
Bedded into aftermarket synthetic stocks with pillars: 45-50#ish front and back.
Bedded into wood stock, no pillars. 35#ish
Pre 64 no bedding original wood stork 20-25 ish with a bit more in front. I do this by feel.
In all cases, on the middle screw, I barely tighten it to just snug and I put a small drop of blue loctite on the threads to hold it fast. This is the screw you really want no appreciable torque applied to. You can bind everything up and stress the receiver. (Especially if not bedded well) Just tighten it enough so the screw won’t fall out.
Additionally, it’s not uncommon on a M70 for the “flat” underside of the receiver to not be perfectly flat. I’ve seen them with a bit of a ridge down the center. They can sometimes have some rather rough machining. This is why bedding greatly benefits them so they fit hand in glove, imperfect receiver to stock.
I have a Pre-64 .270 that shot just ho-hum with its original stock. It was in really good original condition so I didn’t want to bed it and ruin the value. I took that stock off and put it in the safe. I bought a beat up old oem stock, refinished it, fixed an hidden crack, and bedded it. It now does this consistently.