Dakota: I will add my 2 $ worth to your question. A pre-64 70 featherweight action weighs 45 oz. A Rem. 700 long action 43 and a large ring 98 44 oz. so there is really not a lot of difference in action weights. The pre-64 aluminum floorplate is .75 oz. and the trigger guard is .86 oz. so a blind magazine is not going to save you much if anything. That leaves the barrel, stock and optics. The featherweight barrels are .560" at the muzzle which, depending on caliber is quite light, although in a .270 you might get down to .500". Talley lightweight mount/rings is quite light but I didn't weigh mine prior to installing.
However, here is some food for thought. There are some real trade-offs in superlight rifles. I prefer a much heavier rifle, even for mountain hunting and I am 66 years old. I've hunted with pre-64s almost exclusively for the past 30 years. I just got back from a Kodiak Island mountain goat hunt and my rifle was a pre-64 with 25" Douglas barrel in .300Win.weighing almost exactly 9 #. After a very hard climb along with the excitement, I am very glad I had a heavier rifle for holding steady. For mountain hunting, I would personally never want anything less than 8 lbs. I believe the disadvantages of the super lightweight rifles far outweigh the advantages when the moment of truth comes. Good Luck.
