Some data on the 1/9 vs 1/7 debate

[markbob45]

Yes, mil-spec ammo seems to be out of stock everywhere. Palmetto State Armory finally got some M193 in this week so I ordered some. The price jumped up from a month ago though.
I'm leaning towards what you said. If the groups are acceptable in all guns with one ammo or the other I will probably pick one and go with that. I want to use a mil-spec that I can buy in bulk for these guns.
For my hunting AR I use factory loads it likes as a standard then try and reload to match.

[jonconsiglio]

Here's some mk318 in stock - http://usarmorment.com/federal-mk318...se-p-1701.html

Here's some 193 in stock - http://www.glensoutdoors.com/Federal...0-p/xm193f.htm

[markbob45]

Thank you sir

[Munch520]

Originally Posted by CRT2

Look forward to the results of your test. Will influence whether I use my 75 grain TAP or the 75 grain Superformance as primary round for social purposes.

Let me preface this by saying my results are far less scientific than Molon's and serve as a bit of data in the pool I hope some have gained from the other postings in this thread. In addition, we had very limited time yesterday/were very rushed because the range was starting to flood...in our haste we also setup targets 40 yards too deep. After figuring this out and adjusting, didn't have too much ammunition left, I'll re-run this with high count groups in a week or so, definitely without the Hornady Varmint (waste of $).

We tested the following out of a 18", 1:7 barrel (mk12 upper)

Hornady 5.56 75gr Superformance Varmint - this crap SUCKS, my findings were carbon copy of this http://www.nodakoutdoors.com/forums/...p?f=11&t=86686
Hornady 223 75gr Superformance - very good load, I'll get more results with this later
Hornady 223 75gr TAP - not quite as accurate as the 223 Superformance
Federal 55gr - surprisingly good accuracy, small sample size however

Below are a couple pictures, I'll update more later. Shot MOA or better with everything but the Hornady Varmint (surprise surprise).

Hornady 75gr Superformance performed as expected, .58" avg at 140 yards



Hornady 75gr Superformance Varmint was all over the place, had to hold half inch low to hit on target.

(I stomped on the box)

Hornady TAP



Most of the 55gr went through the SBR, but I grabbed a couple for the mk12. It looks like 1:7s shoot 55gr just fine, .5" at 140 yards

[CRT2]

Munch520. Thanks for the results. One question. You and the other site refer to the 556 NATO 75 grain Superformance Varmint #81264, yet I have 556 NATO 75 gr BTHP (features AMP Jackets) #81264 and marked Superformance MATCH. Are these the same rounds?

Checked Hornady and they do not list 75 grain Varmint in 556, yet the box of ammo displayed in the other site shows 75 grain Varmint. http://www.nodakoutdoors.com/forums/...p?f=11&t=86686

Or is this another case of Change the Name to hide the inaccurate?

[Munch520]

You're welcome. Again, sorry it wasn't more comprehensive.

Originally Posted by CRT2

Are these the same rounds?

No they're not the same rounds. Interesting, I had Superformance Match 223 yesterday and it was my favorite of the heavier variants, grouping at .75" at 140. When I get other pictures of the targets I'll post pics of the boxes too.

Originally Posted by CRT2

Checked Hornady and they do not list 75 grain Varmint in 556, yet the box of ammo displayed in the other site shows 75 grain Varmint.

He and I may have gotten an older selection. Maybe they quit making it due to terrible feedback or something? Not sure, I'll ask around.

[CRT2]

This url has info on Varmint versus Match 556 Superformance. Also on page 2 accuracy results with 16' and 20" rifle. http://www.sigarms556.com/viewtopic....955b1512f96c36

[CDW4ME]

Interesting thread. My .223 ammo ranges from 55 gr. - 62 gr. so it looks like a 1/9 barrel is fine, 1/7 is too.

[Munch520]

Originally Posted by CRT2

This url has info on Varmint versus Match 556 Superformance. Also on page 2 accuracy results with 16' and 20" rifle. http://www.sigarms556.com/viewtopic....955b1512f96c36

Thanks for the link. He did much better than I with the varmint.