Will the TAC21 Chassis work with a Remington 700 7mm? Maarten Van Ruitenburg November 21, 2016 19:12 Follow Yes it will. You will need a Long Action Chassis using .300WM magazines. Have more questions? Submit a request 2 Comments Date Votes 0 nikifer November 21, 2016 18:24 Will any of the chassis work with a ruger m77 7mm long action? 0 Raul Verzosa November 21, 2016 19:12 No we do not produce a chassis for the Ruger Long Action M77 Please sign in to leave a comment.