Originally Posted by Alpo
Negative. They will headspace on the little lip, just fine. Howsomever, without the moon clip you have to either punch 'em out from the front with a pencil, or pick 'em out from the back with your thumbnail or pocketknife. The moon clip's real purpose is to let the ejector star push 'em out.
Very early Colt 1917s did not have the lip, and need the clips to work. Webleys don't have a lip, so if you have of them that has been shaved, it also requires clips. Smith, however, has had the lip from the beginning, and Colt went to it within about the first six months of production.
So it is negative as far as headspacing .45 acp in a revolver without using a moon clip as long as you (1) like to pick them out with your fingernails or pocket knife, etc. and (2) you are not shooting any of the old .45 acp Colt model 1917 revolvers, made by the millions and used widely during WWI, that are not made with a headspace.
Thanks for the informative reply but I think I'll stick with my moon clips for now.