The post by Scalce reminded me of something that I read here, people seem to have good luck with AA1680 and Lil'Gun in both sub and super-sonic loads with the M1S AR.
Quote:
Originally Posted by Scalce
-the throat length is long and you can't seat certain bullets to the lands without going over mag length
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Also, pay very close attention to this as you start to work up loads.
You may be a very experienced reloader and already know all of this, but someone else reading this thread may learn something.
On my M1S rifle I most definitely can get a bullet seated out far enough to get into the lands while still fitting in the mag. Did it, got the way over-pressured case to show for it...
A different bullet may not play out the same way, check your equipment and be careful.
Good luck and stay safe!
Mike