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on an unrelated to color post,……

I’m seriously considering getting a .300 BO upper to swap onto one of my ARs just for a change.

So I'm definitely interested in a range report from the OP on his new rifle.
In laymen terms, think of the 5.56 as .40 cal (full charge) and the .300 BLK as a .45ACP full charge. Bigger, slower, and barely noticeable in power. The .77gr 5.56 completely destroys the .300BLK in every aspect, except sub-sonic suppressed. That is where .300BLK shines.
 

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That may very well be,
but I have been unable to get a 70gr bullet to fly straight out of either my 20" 1/7 or 16" 1/7 AR,
I am reluctant to even try a 77gr bullet.
Ahh,

Your 1/7 rate is on the "not yet" side of 77grain. Many say it will work, while others say no. That's a twist factor of 2:3, "perfect" is right at 2. You can launch the 80 and above with perfection.

Mine are 1/8 rate by purpose and excel with the 72 & 77 grainers.
 

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Based on the information on that chart I wouldn't say it blows it out of the water in ever aspect. I would say certain loadings of 77 grain 5.56 out of a particular barrel length can produce a marginal edge in energy foot pounds beyond 200 yards compared to certain loads of 300 BO. And even then the difference is only roughly 100 foot pounds.
Agreed, but that's a .22 out hammering a .308...In which the .308 was specially designed to out hammer the .22. Think that over for a moment. The .300BLK was supposed to "destroy" the 5.56 to 300m, yet the 77gr .22 is not accepting that outcome.
 
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