Quite a few of those old original 99s could benefit from a recrown job. My most recent one was actually a 303 1895 model made by Marlin, and it keyholed bullets regularly. I had a 30-06 finshing reamer with no throat and I ran it into the muzzle for 1/4" until I could see sharp rifling. No further smoothing of the crown and it then shot into 1.25 MOA with open sights.

Durn good rifle for its day!
Regards, Joe

You can lead a man to logic but you can't make him think. NRA Life since 1976. God bless America!