Nice AI summary:... why do some 40x have a straight bolt handle and some have the swept handle seen on most 700s?
"Remington introduced the swept-back bolt handle on the Model 700 in January 1962. This was part of the overall design of the new rifle which included a more streamlined tang and graceful trigger guard. The bolt handle was further swept back in 1969, but changed back to a closer angle in 1974 due to complaints from hunters about their trigger fingers getting rapped when shooting magnums."
Previous to 1962 the 40X was closer to the straight bolt handle 721.