Quote Originally Posted by markm View Post
I won't shoot any of it in my guns.
Not to derail the topic.

This is the first time I've heard anyone say that categorically. IMHO there is no more standard ammo than M193 and M855 for AR. Bolt or precision guns might be different, but still need to be able to handle M193 and M855.
You have more experience with ARs than I do, but here is my take on it: if an AR with 10.5" and above barrel won't shoot BOTH of them reliably suppressed and unsuppressed there is serious issue with a gun.