It sounds like your malfs were FTRTB, correct? (Failed to return to battery). And you just needed to nudge it a little?
So yeah, if it's not rubbing then you have:
1. gas system (plug not in all the way, leak somewhere)
2. weak op rod spring
3. not enough lube
4. Aaaaaaaahhhhh.... some other obstruction in the action? bad refinish? barrel bulge? Clips out of spec (this one could be viable).
5. solar eclipse
6. SARS
7. Bird Flu
8. That about covers the serious ones.
Am I missing anything guys? Where's M1-G when you need him.
Wait, I forgot this one:
You accidently dropped it in a freezer over night, or you did it on purpose to torture test....... And you know the ole GI fix for that is to pee on it.
Just a side note, I used to not care about different pressures, but it's probably wisest to use M2 ball or ammo with approved or spec'd pressure for Garands. But they may be more robust than people make them out to be. I've shot a few hot rounds through mine but I got that out of my system. At least there are commercial manufactures making acceptable rounds now. The core lokts 150 grain probably aren't too far off, but who knows.