Most people agree with the "four and done" rule. The only exception might be if you have a rifle that has a gas system that can be turned off so that the action has to be cycled by hand. My Sig 716 beats the brass up so bad that I don't think I will load it more than four times even in single shot mode. Also, you may want to check this out:
Lots of good info for reloading for semi auto service type rifles.