The shooting sports are different now in the 2020s then they were back in the mid 20th Century. There are many new different courses of fire that didn't exist back then. Rifle types are different than they were back then. Also certain segments of the shooting community that were at a disadvantage possible are now on equal footing. With this in mind the USHPSA National Records are different.
The different categories are pretty self explanatory but here are a couple of important distinctions.
National Records are found here