One mistake on the Nammo load, but was replaced by another round, to make group 7. 
All groups counted were 7 shots.
If you read all of our site, you can see we actually believe AR15's have an issue, generally, with the First shot out of the barrel, but that is reality, you have to take a first shot, we we could it, as the "7 shot group", then we rank the 6 shots, then rank the 5 shot group.  This is why we did 7 shots, not 5.  Because with 7, you see way better pattern overall.

Look at that Norma group.  Jeez.  4 shots are less than .2", and 5 shots are .35", 6 shots are .6" and all the shots are .79". 

See ranking chart below for details on results, then also statistics on FPS versus Brass weight.

Keep reading all over the internet...Federal is too soft, Winchester quality control bad, Lapua is the best, Hornady X, etc etc etc.  All opinions based on mostly small samples and subjective views.  In reality, it only matters how they shoot.  And ALL of them shoot, pretty much like each other.  Even the mixed brass grouped very competitively, and that is 2x shot brass with HUGE weight extreme spread.

Ok.  Here is what the columns mean.

7 MOA or Rank 7, means it took ALL the shots into account.  All 7 shots.

6 MOA or Rank 6 means it discounted the 1 flyer in each group, which was majority FIRST SHOTS from magazine.

5 MOA or Rank 5 means it counted the 5 best shots.

This is why you don't do 5 shot groups if you want to see what load is best, because it might not be consistent.  7 is a lot better.  With 5, you can get a few lucky groups that are say .3 or .5", but over time, when you do 7 shot groups or something like this, those super low numbers will probably average out over time to be .8 or .9" because its AN AR15, not a bolt gun.  Many moving parts, way looser chamber, not a super heavy barrel, etc.  Nowhere near as consistent as bolt gun.

To us, we value the 6 round group the most.  Let us explain why.

Now, in an AR15, you could get 1 flyer for various reasons.  This is no secret, it happens for many reasons.  So look at the 4 different groups, which are all the same MOA result.  Which pattern would you like to have?  Obviously, a group with no flyer, but this is near impossible in AR15 platforms if you group enough bullets.

To us, upper right group is worst.  Terrible result.

Upper left is the best

Lower left is 2nd place, because first and last shot are suspect in AR's.  Bottom right is not good either.

So if you find anyone on the internet who says its a 2" group, its 2 MOA, just agree and say "yes, thank you" and do what you want. 

All the brass looks good, and the internet consensus that Federal Brass is soft, didn't play out, as you can see the Federal Premium brass barely has any indentations or stamps in it, except one on right, but that is on the other brands as well. 

The Mixed brass at the bottom was quite a disparity.  We have some NATO pieces, a crimped one, and some 223 pieces from different brands.  Didn't matter.  Lights out group.

This is a SHILEN WOA barrel. The other test above is a WOA Predator barrel.  Both are gas guns, not piston.

This target is Berger 77 OTM using 21.5 grains Benchmark powder, 2.255 OAL with Federal Gold Medal primers.  As you can see, its a lights out load, because these are all 7 round groups, at 100 yards. 

We tossed in 2 more groups just to prove a point.  What is the point?  The point is, Benchmark powder is simply the best, or top tier, tier 1 powder you can use in an AR15, and that is period, end of story, lights out, good night.  We didnt even tune or change the load, kept it at 21.5 grains, picked up a pile of mixed brass, then another 5 1x shot used Nammo brass, put regular CCI400 Small Rifle primers in them, and there you can see.  Both groups are .7", and that is using Berger 70 grain VLD's not the 77 Grain OTM's like the test standard.  because the point is, it doesn't even matter.  You put 21.5 grains, or 22 grains of Benchmark using pretty much anything, with a quality barrel?  It shoots lights out. 

Again, this brass was taken straight out of the bags/boxes.  Not neck turned, not primer hole drilled, not prepped by us.  However, brass, such as Nosler comes fully prepped.  We just full lenth sized all this, and used expander ball in neck.  Thats it.  Of note, the mixed brass?  The cartridge length varied by 15k because it was 1-2 times shot and all the necks have stretched longer.  Not trimmed.  The mixed brass did a .28" group if you count the best 5 shots.  And the mixed brass not even using match primers, with totally wildly variable cases, is .74" 7 shots.  Can that be beat?  Consistently?  7 shots is quite good sample.

Look at that.  Federal was most consistent brass, combined winner, using 2 different guns, and 2 different great loads.  Combined scores, lowest wins.
Federal 17 Points   TIED FOR FIRST

Norma  17 points    TIED FOR FIRST

Nosler  18 Points   Runner up

Just add up score column for both tests, lowest score wins.

I think its fair to say, the Berger 77 OTM is slightly more accurate than the Nosler 77 CC.  BTW, we didn't chrono all these this time, but the average FPS with this Berger 77 OTM and the 21.5 grains of Benchmark is about 2,625 FPS

To be same FPS as the Nosler load at 22.0 Benchmark, the Berger 77 OTM would need a load of 21.5-21.7 depending on the brass used.

Watch, now there will be a run on Federal Premium brass, the brand so many people on the internet love to bash and call soft, or whatever.  It outperformed everything except the Normal, and its half the price of the Norma.  Too bad in 2021, nothing is in stock.