The Remington 721 IS NOT the same as the 700. Its a stronger longer action after the 1917 Enfield action.
Probably the best action Remington ever made. But in cutting cost they went to the 700 action like Winchester went to the post 64 model 70.
Not saying there is anything wrong with the 700, but its not as strong as the 721.
Not for the shorter shells though.
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071