You don't have to be a handloader for .300 blackout there is cheap and expensive stuff commercially.
.300 BLK doesn't require much to run on an AR. 6.8 SPC II has a little better ballistics long range.
Do both....... :D
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A good case for going 300 BLK relative to e.g., 6.8 is made here...
http://300aacblackout.com/resources/300-BLK.pdf
Lots of other info is also available on that site.
I read on a couple places, 6.8 specific forums the specs they used for 6.8 for those comparisons were the original 6.8 not SPC II so they were wanking about it.
6.8 SPC still comes out on top for #'s but as what has already been said the .300 BLK is very adaptable, super simple to convert and to run.
If Noveske made a 6.5grwndal barrel I would have a 6.5!
I'm just pondering the 300 versus 6.8 right now. I'll probably get one or the other in the next couple months. The seemingly greater availability of 300 ammo and lower price may give it the edge for me over 6.8. But either caliber will be good for what I want, another plinker and deer/hog gun.
I see more ammo for 6.8 than I do .300 BLK. I think .300 BLK has cheaper commercial loads than 6.8 but in reloading the .300 BLK is the clear winner. What got me over the "black" side was the versatility of the .300 BLK in ballistics, and the cost of converting an existing AR. Can't forget to mention the magazine issue. The 6.8 mags are pricey for the good ones.
From what I can formulate .300 BLK has a LARGE industry monster supporting it (the freedom group) plus a LOT of the other industry jumping on the bandwagon. It must be selling well as just barrels for the .300 are hard as hell to find in stock and the ammo commercially is always sold out. Where as 6.8 Remington is treated like the bastard child now from Remington, even though they helped make it, my take at least, from their efforts in supporting it is they could care less for it now. So others have made better ammo for it.
I am always looking for different AR uppers. Especially short barreled ones. The 6.5 Grendel looks better on paper than the 6.8 so I bought a couple of 6.5 uppers to try. I tried the 6.5 Grendel and really liked it because of the variety of the 264 bullets.
The 300 Blackout also look really good on paper. I have a couple of 12.5 inch 300 Blackout barrels heading my way. I want a short barreled AR for suppressed close in hog, coyote and deer work and think the 300 will fit the bill. Can't wait to build some rounds especially the subsonic 220-265 grain bullets.