Quote Originally Posted by Airgator0470 View Post
No problem Mike... fair question, if you look at the extremes: Lapua at 29.2 vs. LC at30.4, perhaps with those two cases one might be able to detect a noticeable difference as there is a spread of 1.2, ... but when you look at and consider the difference between the more common brands, Win commercial, WCC, Fed Tac, Hornady, and LC, it's only a spread of 0.4... insignificant in my opinion and experience as I get Hornady, Fed Tactical, and LC brass for free and have not encountered any pressure issues one way or the other.

Personally, I think the thick mil brass issue is an over inflated issue, not completely worthy of ignoring, but not enough to worry about. But each reloader must decide for themselves where to place additional caution. Me... I think using a true 5.56 or Wylde chamber is more important when trying to duplicate military-type rounds (true 5.56mm and MK262) than head stamps (granted you're using the ones above an not some obscure crap).
Edit to add- Perhaps it's better stated this way... if 24.5grs of TAC shows specific pressure signs with Win commercial, I'd suspect the same will show if you change to Fed Tac... I think at that point, the chamber, powder, powder charge, and weather will be of more influence than the head stamp. Some of my good loads are using RP brass... and not the WCC or LC, who knows...