Sure it's very likely that your body can make use of 5 times the USDA of protein.
well, i was probably averging 80 grams per day, eating like shit.
the US RDA for my size is 75 I think. And i'm sure it was enough for HEALTH purposes.
But my number for muscle strength, recovery, glycogen/water levels, etc etc etc, must lie somewhere between 81 and 300 grams. Yeah, I"m on the high end with 300 grams, but shit, I added 4 reps in a week. I have been stuck at one number (high teens) since summertime, and suddenly I just don't stop and can do 4 more? Whatever I was lacking in recovery or calories or whatever, I seemed to have fixed it.