No they don' t glass bed their actions and the basic design of the 77 action and front screw especially makes that procedure really unwarranted. If I were to glass bed a 77 I would do the barrel shank and that is it. My 77 all weather has had no bedding work at all just a trigger job and it shoots beautifully. Its a 7 mag also and I have shot 140-160 grain bullets thru it and they all shoot great