@Alexbrooks Can you comment on the differences among the various versions of the FBI duty load that Federal has produced?
From what I can tell, the the FBI was first using XM556FBIT3, a 5.56 pressure load.
Then it seems they switched to XM556FBIT3M, which despite the "556" in the name was apparently .223 pressure (based on the box markings and case headstamp). Then in a thread last year you mentioned another .223 pressure FBI load, XM223SBCT3.
If XM556FBIT3M is a .223 pressure load as I suspect, are there any differences between that and XM223SBCT3, or are we just talking about a simple change in product numbers to signify a new contract/packaging differences/etc.?
OP, hope you don't mind me piggybacking on your thread since you did mention that you were looking for XM556FBIT3.