I don't seem to have problems with any of them firing. I have noted some problems with the Rem being a little short on powder when fired from the Ruger Mark III, but they fire and at the short ranges, it doesn't effect accuracy, but I notice the action being slow to cycle.
Still 550 rounds for $15 is a bargain.
$13.97 as of 2 days ago at Owasso Wal-Mart!