I finally sorted out my many .223 cases and found that I have many which are slightly below the trim to length of 1.750". By slightly below, I mean anywhere from 1.738 to 1.745". I plan on loading them anyway, as I've read factory ammo often has cases slightly below the trim to length. I will likely load them just for plinking out of a S & W MP 15. I thought I'd double check with some more experienced reloaders. Any concerns here or suggestions?? f/y/i...I usually stay well below max charges here and the M&P barrel is 5.56/.223 in any event.