300 blackout your thoughts?

I'm in the process of ordering parts to build a 300 BLK SBR and SS. 9" barrel and an AAC can. Gonna frickin ROCK.

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Thinking of building another AR in 300 blackout or 6.8spc. I am leaning towards the .300 since it uses the same bolt and mags. Any of you have either or these cartridges? Will probably end up deer hunting with the rifle.

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300 Blackout=300 Whisper=300/221. There are very minute dimensional differences in the 300 Blackout compared to the 300 Whisper, enabling the 300 BO to be a factory round w/ SAAMI specifications for chamber pressure and chamber specs. I've got a 12" 300/221 Contender barrel I've used for deer hunting. It's a fine deer hunting round. In my Contender, I get 2250 fps from the 125 gr Nosler Ballistic Tip.

I'm not into the AR platform, but it I was, the 300 BO would seem to make more sense than the 6.8.

One other point re: the 300 BO. If you intend to shoot the 220 gr, subsonic bullets, be sure you get a barrel w/ the appropriate twist for this.