This is discussed frequently. Projectiles are Sierra match kings. Powder and charge are 42ish grains of something near 4064. Some have said it's imr4064, or 4895, or a proprietary powder. My bet is option 3, but you can get pretty close with the other two.
A friend of mine used to have a friend that at the time was working for Federal. I personally saw an email that said they used a industrial canister powder. But the closet thing commercially available was IMR 4895 close to 42 grains. This was in the 1990s Maybe 1992. Take it with a grain of salt. But it's VERY close to one of my favorite loads.