My experience with 99s is limited at best, but I doubt it has a headspace problem as such but a lever problem.
When you raise the lever you'll feel a little resistance at the last little bit of its movement. That resistance at the end is basically the "Camming over" and locking the breach bolt in place. Over time with use the tip of the lever and breach bolt mortice wear and allows the breach bolt to move rearward when firing a cartridge. The typical indication are primers protruding from the casehead after firing.
Some simply bend the lever , but personally I and others feel rebuilding it is the correct repair as in this example > Savage 99 lever droop
If you take the rifle to a 'smith ask him/she /it how they would do the repair. If its bending the lever....find a another 'smith!!!!
All I got from smith was the gun has a headspacing issue and that he would never shoot t unless i had to defend my life. It was my dads,so t has some meaning to me. I would love to carry it someday just for that reason.
He works at a reputable gun shop here in the lehigh Valley. I had him do some work on some other stuff and was happy. I appreciate everyones help here. Wildbill may have something becuase the lever is tight and wgen you go to work it it really is hard to open