Sandwarrior,
The milspec for .30-06 was only 50,000 PSI, not the 60,000 PSI currently approved by SAAMI. Most of your "Garand" loads are always going to "seem" lower in modern published manuals that address the issue, Hornady #9 for example.
Although the load I posted is a "do all" load for the M1, my own personal M72 duplication load is 175 SMK over 47 gr IMR-4064. That nets me 2540 fps and is as close as I can get using modern components. If you load 50 gr of modern IMR-4895 behind the 175 SMK, that is a tad on the warm side for the M1 gas system, even though the load seems within current published loads.
With an adjustable gas system you can run SAAMI ammo all day long, action strength (chamber pressure) isn't the issue with the M1, its the relationship between port pressure and op-rod speed which is exceeded both by running the wrong propellants or by running too much of the right propellants. The risk of damage is with repeated use over time, the rifle will stand up well to the occasional beating, but extended use of the wrong components or loads will wear out or damage your moving parts.