SS, check this out... What projo(s) do .308 AR shooters look for? 168s and 175s, sometimes 165s... What projos do 300BLK shooters look for? The light stuff in 110, 115, 125gr, plus the heavies, 200~220...
Who out there is looking for any 150s? ME. And they're everywhere.
I shot the 220 subs today - disappointing. Now, looking at that CMMG info a few posts up, it matched my barrel exactly. I have the 16" carbine gas. Should work with 220gr Sub suppressed (not tested), supersonic unsuppressed (passed that with flying colors), and supersonic suppressed - didn't test that either, but I'm positive it'll cycle that with even more pressure...
Now, it's "not recommended" to shoot the 220 subs unsuppressed, with the carbine gas system - it failed that miserable. Not from an accuracy standpoint - it was ripping up the 50-yard target I was going at. However, it shot the first two rounds, didn't chamber the third. Had to hand-cycle it. And the 4th was hand-cycle. Every round was hand cycle... after it fed the first time. Not enough pressure in my Nemo 16" carbine-gas barrel to cycle the 220s unsuppressed. That chart nailed that one.
I'll be loading up some 150s shortly - they'll still be supersonic. <thumbsup>