The answer to that is what pressures the data is based on, depends on who is doing the testing. Barnes doesn't post pressure levels, but they probably use a more conservative level for each of the 45-70 levels, trapdoor, levergun and modern rifle like Lyman and Speer use.
Tim
Trapdoor
Hodgdon - 28,000
Hornady - 25,000
Speer - 21,000
Lyman - 18,000
Levergun
Hodgdon - 40,000
Hornady - 40,000
Speer - 28,000
Lyman - 28,000
Modern Rifle
Hodgdon - 50,000
Hornady - 50,000
Speer - 35,000
Lyman - 40,000