If I understand your questions correctly, you are thinking about pillar bedding the 77 (right?), and the angled front screw has you confused. Let me know if this is not the case.
I did a 77 earlier last year and just bedded the mating surfaces of the action, recoil lug, and trigger guard. Didn't try to pillar bed. Figured if the first try didn't work then I'd cross that bridge. For what it's worth it all turned out fine. My suggestion would be to just bed the surfaces as a laminated stock should be OK.
I don't use the action screws when letting the glass set up. Too much chance of one sticking. Usually just use big rubber bands or bungee cords or the like to hold everything together.
By the way, you could try this technique that I have used to pillar bed in the past (though haven't tried it on the 77). What I did was get some quarter-inch wooden dowel rods and made 'action screws' out of them. That is, cut down to an inch or so longer than each action screw, and tapered one end so it would start into the hole in the receiver.
Then coat each rod with my release agent, which is paste wax for wooden floors. Great stuff.
The screw holes in the stock were drilled out oversized, say 3/8" or so. The barrel/action was put back into the stock, the rods put in, then the glass spooned around the rods to take up the excess space. Then the trigger guard was put back on. This holds the rods in place and ensures that the holes through the glass are lining up with where the screws are going to go. I would think that if the trigger guard was not used then there wouldn't be much chance of making the initial hole in the right place.
I was expecting to have to drill out the dowel rods but they came right out after the glass set up. That give me a perfect pilot hole for the drill bit. I drilled them out just a bit, say 5/16", to ensure that there would be clearance on the action screws.
It all worked out really slick. Like I said haven't tried it on the 77 but would imagine that it would work.