Before you do anything, take one of the loaded rounds and try seating the bullet to the proper depth. If you're going to shave lead, it will be obvious. If you shave enough that the cartridges will not chamber properly, you've got a lot of bullets to pull.
If you do shave a little lead but not enough to prevent chambering, take 10 of them to the range and shoot them. If your group is not noticeably different than your other rounds (evaluate group size not placement) then repeat the process on the rest of them. You may have a couple that shave too much, oh well. That's better than pulling 400 rounds.
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USMC '71 - '78
"I am only one; but still I am one. I cannot do everything; but still I can do something; and because I cannot do everything, I will not refuse to do the something that I can do."
Edward Everett Hale