When bullets heavier than 160 grains are shot from 308 Winchester or larger cases, the torque on the barrel is enough to twist the barrel pivoting about the recoil lug. The receiver behind the lug works loose from full contact with the epoxy bedding.
It wasn't all that noticable until the early 1960's when high power match rifles in 308 Win started breaking all the records held by the 30-06 and newer 30 caliber magnums were outscoring the 300 H&H at 1000 yards. All due to better quality Sierra hollow point match bullets replacing their FMJ ones. No problems when Winchester 70 actions were used.
A Remington field rep knew about this problem. He tried to get Remington to make a flat bottom & side receiver for centerfire match rifles but they nixed the idea. So Ikey Starks, the rep, took his Winchester 70 based 308 Win to the 1966 Highpower Nationals and won. He soon quit Remington and opened his own shop.
Meanwhile, one or two of the military teams put 2 inch long recoil lugs on their Rem 700 based 300 magnums in hopes they would work. Helped a little. They stuck with the Winchester 70 based magnums. The favorite was a single shot Win 70 action without the magazine port; solid steel there and the stiffest action around. Twenty were made for the US Army and Marine Corps teams.
Flat bottom/side aluminum sleeved Remington receivers worked out well. Their often breaking extractor got replaced by one like Sako uses. Nothing fixed Remington's reliability problems in rapid fire matches.