The gunshop I hung out in when I was a kid harbored hard feelings towards the post '64 M-70's and had me convinced that the M-700 was a better product. The old style M-700 I got in .350 magnum split from midway through the pressed checkering in the forend right through the inletting and deep into the pistol grip. So much for the superior Remington stock!! I recall that they claimed to be kept busy replacing a number M-70 bolt handles which broke off with normal use, and I suspect that the rifles Winchester produced in the early '70's were probably poorer than those produced earlier or later. In hindsight, the M-70's flat receiver is a better bedding surface than the round M-700. The Winchester extractor is superior to the Remington. The Remington folks claim their extractor is infallible, but I've had to replace 3, two on M-700's and one on a M-7, when they began to skip past the case rims.
A pal of mine bought a M-70 .300 Winchester at the same time as I bought my M-700 .350. I smugly strutted around knowing I had the superior rifle in the superior caliber. Well, I still think that the .350 is a better big game round than the .300 Winchester, but the 1972 production M-70 despite it's reputation continues to provide good service to it's original owner while my .350 magnum is a distant memory.