7mm-08 in a AR platform

The 154 SST has a G1 BC of .530 as well. I think a 16" could push that at 2600fps, since a 24" pushes it up to 2800fps with RL17.

A prone gun will be boring: too heavy, sits on a bipod, can't shoot positions, can't really stalk hunt with it, etc.

A Designated Marksman Carbine can be used to shoot people in the face in the house, then reach out to 1000yds plus, then taken hunting. If you cut to 16" or 17", you will have another section of blank available for an SBR or TC to sell.

This is with the 154gr SST at 2600fps
Code:
       Range    Velocity    Energy     Trajectory         TOF          Drift
      (yards)     (fps)     (ft-lb)       (MILS)         (sec)         (MILS)
          0      2600        2311           0.00         0.0000         0.00
         50      2515        2164          -0.37         0.0586        -0.09
        100      2433        2023           0.00         0.1193        -0.19
        150      2351        1890          -0.15         0.1820        -0.29
        200      2272        1764          -0.44         0.2469        -0.40
        250      2193        1645          -0.80         0.3141        -0.50
        300      2117        1532          -1.21         0.3837        -0.61
        350      2042        1425          -1.66         0.4558        -0.73
        400      1968        1325          -2.14         0.5307        -0.85
        450      1896        1230          -2.65         0.6083        -0.97
        500      1826        1140          -3.19         0.6889        -1.10
        550      1758        1057          -3.77         0.7726        -1.23
        600      1692         978          -4.38         0.8596        -1.36
        650      1627         905          -5.03         0.9500        -1.51
        700      1565         837          -5.71         1.0440        -1.65
        750      1505         775          -6.44         1.1417        -1.80
        800      1448         717          -7.20         1.2434        -1.96
        850      1393         663          -8.02         1.3490        -2.12
        900      1341         615          -8.88         1.4588        -2.29
        950      1292         571          -9.79         1.5728        -2.45
       1000      1247         532         -10.75         1.6910        -2.63

Did you really mean "shoot people in the face in the house"?

That is somewhat sad and disturbing.....
 
Did you really mean "shoot people in the face in the house"?

That is somewhat sad and disturbing.....

Yes I did. Am I missing something? Inside the car is a bit tight with an AR10 platform, so I left that out, but you certainly can shoot from the car with one. I prefer something much smaller like an 11.5" AR15, but to each his own.
 
A 162gr A-MAX to the face in close quarters would be pretty impressively devastating I think. Those bullets mushroom rapidly in soft tissue, so hitting any of the maxillary or cranial bones would be quite gruesome before it continued on.

We did gel-testing with them in the 6.5mm bore this year, and at 2599fps impact speed, the 123gr A-MAX penetrated 21.5", retained 83% of its weight, and expanded to .60 caliber. With a bone impact, I think it would separate into at least 2 projectiles, shed the jacket, and lead shower the cranial compartment so violently, that you would have a major avulsion with significant loss of brain matter.

As I mentioned earlier in the thread, I've seen a little 62gr 5.56 M855 projectile do that from the K2 on a NorK SF scout swimmer just outside of Camp Greaves by the Imjin River.

When I look at putting together a more utilitarian long arm, I lean towards the shortest gun I can get with the terminal performance made up for in BC and bullet construction, which is why I wondered out loud how a carbine 7mm-08 would turn out, using the 162gr A-MAX.
 
7mm-08 is IMO one of the most underrated calibers out there when it comes to long range. Its definitely not underrated when it comes to hunting, all one has to do is look at the sales its a very popular hunting caliber. But once again IMO it has unrealized potential for longer stuff. 162gr AMAX at ~2700 or so is a potent load. May not quite measure up to a .260 but it comes close. With the larger bore you should be able to get away with a bit shorter barrel than the .260 as well.

LRRP, if you dont mind me asking, Id like to hear some more details on the commie scout. Was he by himself? What range was the shot? Did the commies not really care about their scout getting killed? Seems like that wouldve set off some wider geopolitical consequences than a single firefight.

Thank you sir.
 
7mm-08 is IMO one of the most underrated calibers out there when it comes to long range. Its definitely not underrated when it comes to hunting, all one has to do is look at the sales its a very popular hunting caliber. But once again IMO it has unrealized potential for longer stuff. 162gr AMAX at ~2700 or so is a potent load. May not quite measure up to a .260 but it comes close. With the larger bore you should be able to get away with a bit shorter barrel than the .260 as well.

LRRP, if you dont mind me asking, Id like to hear some more details on the commie scout. Was he by himself? What range was the shot? Did the commies not really care about their scout getting killed? Seems like that wouldve set off some wider geopolitical consequences than a single firefight.

Thank you sir.

Not trying to derail, but no, he wasn't alone. He was part of a 2-man NorK SF scout swimmer team that we suspect had infil'd using the Imjin River, which was very common for them. Cross-border special reconnaissance and agent infiltration has been a constant thing over there, and there were incidents happening frequently on the DMZ, as well as on the East Coast of the Korean Peninsula. They were playing big boy games, and one of them caught a 5.56 to the head...rules of the road. No hurt feelings when you're in your enemy's backyard and you get dirt-napped.

His buddy swam deep and escaped, was never seen or captured. They had a duck bag with them (waterproof duffel) filled with Chicom copies of the M16, demo, initiators, Chicom Type 54 Tokarev copies IIRC, and the KIA was wearing the tan Warsaw Pact wetsuit common to Soviet Naval Spetsnaz. All of this was photographed in sequence, and as they removed his wetsuit, it revealed a South Korean ROK Army Platoon Sergeant's uniform, with 3 badge and patch deficiencies as to placement.

He was in his mid-to-late 30's, and had a physique typical of the most physically-fit type of frogman, with very pronounced lats, large quads, basically a Korean Arnold. One of my Squad Leaders had caught 2 of them filling out an objective sketch just outside the chain link fence surrounding Camp Greaves on our Southeast side, right where this picture was taken:



If you look closely in the picture, you can see the fence and triple-strand concertina on it. I think the NorK SF had gotten accustomed to being able to conduct point target recce on our camp without much interference, and they got caught with their pants down, literally, when the ROK Army kid ran up on them and blasted them with his Daewoo K2. The funny thing is that hardly anyone in our Battalion even knew about this incident, but because I was in the Recon Platoon, we got a full brief on it during a foreign weapons class by some intel weenies from down south, who had all the photos.

There were times when both green and red tracers could be seen flying towards each other and all over tarnation when border skirmishes would happen, and the NorK's were trying to provoke us by rapidly turning on flashlights into their mortar tubes. Then there was the submarine incident in the winter of 1996-1997, which is another story entirely.
 
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Yeah, the combined propaganda music from both the North and the South had this ethereal sound in the winter that wasn't as mind-numbing in the summer.

We'd be running PT towards the Southern MDL and the noise would get louder and louder, and you're looking at barbed wire landmine signs on either side of the road, so you couldn't just break off from formation to go dump a loaf like in the States. We mostly ran Squad PT though.

Winter conditions were pretty brutal, everything iced over, and Manchurian winds blowing through you. The summer was really humid and hot.
 
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I built a 7mm-08 AR30* on a set of J-D Machine Snipers Hide receivers 3 years ago. Found a 1-10tw AR10 blank on Krieger's inventory list, which I finished at 25", after chambering with a slightly improved version of the 7-08. We went with .002" less case body taper, moved the shoulder .068" forward, and went with a 30* shoulder - the reamer name was Kiff's idea, not mine. I drilled the gas port with a #49 drill, and kept going one #drill size larger at a time as I test-fired, until I got the bolt to lock back on an empty mag. Wound up at #45, which is .082".

I used DD Lite 12 rail system, RRA 2-stage NM trigger, LMT SOPMOD buttstock, PRI gas buster charge handle, & PRI 20MOA sloped rail with a Weaver 3-15x50 tactical scope in TPS TSR low rings.

So far, the only really accurate load I've found in it used 2000MR/WLR/S130MK in old LC73 cases, running 2812 avg vel. Finally got a couple more 8lb jugs of 2000MR, and intend to try it with S168MKs in formed brass. None of the S168MK loads I'd chrono'd so far have gone over 2450fps, and accuracy more or less sucked with both the 168s & some 150MKs I tried. So until I got the new supply of 2000MR, I'd more-or-less lost interest in this rig, and have been thinking of pulling the 7mm bbl & replacing it with a Krieger in 308. Krieger's expected delivery date on the 308 AR10 blank is Dec. 31. I figure I owe it to myself (and the 7mm Krieger) to at least try some 2000MR with the 168s, or maybe even a few H162AMaxes, but if it doesn't perform when I do, I think I'll just pull it and set it aside. Could be that a 1-10tw bbl is too slow to do a good job with the 168s, but it should still handle the 150s OK.

Originally, after managing to wrangle a spare J-D upper with the SH logo, I thought it'd be cool to have uppers in both 6.5-08 AR30 & 7-08 AR30 - there's a 6.5mm AR10 blank out in the shop, waiting on me to make up my mind whether to chamber it for this rifle, or try to sell it to a customer. I have a good bolt rifle chambered with another version of the 6.5-08 Imp 30* with less body taper, and I love the way it shoots, so it'd be sweet to get similar results out of the gas gun version of it in this SH AR10. .
 
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flatland1:

How much jump is there in your chamber? Are you past mag-length OAL so that the pills have too much jump?

fmsniper: Good to hear from you again. Was wondering how the 7mm-08 project is turning out.
 
LRRPF52 -

The reamer print Dave sent shows .108" throat dimension; the SAAMI std chamber print shows .119". I'm not having to jump the S168MKs all that far when they're seated to mag length; same goes for the S150MK & S130MK. None of the other bullets I've tried so far have shot any better than the S130MK, but it'll hold well under 1 MOA at 600yds in decent conditions. Would sure like to get the same results out of the 168s. Haven't had time to experiment with the 168s & PP2000MR yet, but will post the results with that combination as soon as I'm able.

Been in the field for the past couple of weeks, and now have got to get some rifles finished & delivered so I'll have time to play with my own stuff. For example - there's been a new Kahles K624i AMR sitting on my DTA SRS for about a month, and I've only got about 25-30rds fired behind it so far....
 

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I had a spare 20 inch upper, that I debated on the 7mm-08, or 243 route.

I decided 243 for this one because I found a 19 inch KAK barrel that I can just drop in. But I am interested in the results of this experiment as well.