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.308 AR build |
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sucker76
Optics Journeyman Joined: June/13/2013 Location: Texas Status: Offline Points: 392 |
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I should. I shoot my cousins Oly 45 AR and its a hoot. I just acquired a 9mm AR. The Tommy gun has just been my unicorn. I've always wanted one. This statement kinda derails this thread so I'll get back on the subject of AR10's. If I'm not shooting Mil surplus ammo will any AR15 trigger work in an AR10? I understand the 308 specific triggers are only for added force to ignite hard primers. |
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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AR-15 trigger in an AR-10… some people do it and you are correct that as long as you are not shooting military ammo, you SHOULD be OK.
I wouldn't do it… why put a non-spec trigger in your AR-10? I know people who have done it, and as far as I know have had no problems. But I wouldn't do it. Even if I gave up shooting mil ammo, I would stick with an AR-10 trigger. Personal thing… if you are comfortable with it, use no mil-spec primed ammo… should not be an issue. However, one of the good reasons to have an AR-10 is to be able to use all forms of .308/7.62x51 ammo… at least to me. But I don't like AR's much anyway...
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sucker76
Optics Journeyman Joined: June/13/2013 Location: Texas Status: Offline Points: 392 |
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Thanks. I found the 308ar site last night and that's been helping me weed through the differences in AR10 and LR308 etc. I am going to build a 6.5 Creedmoor and reloading so military 308 primers aren't an issue. There is a larger variety of triggers for the AR15.
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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Having built a few of each now, I recommend you go with an AR10 trigger. As for AR10 vs LAR308, I've always gone with AR10, but no reason for that, just luck.
Figure out what you want the gun to do well, and build the gun to that end. I've done 18" and 20" and 16"; I now have the 16" and couldn't be happier. I lose a bit of velocity, but I don't pick up that gun if I need to make a 600 yard shot. But in tight spaces, it moves quickly, and at 20 rounds of 168-gr ass-kicking, I have a bit of confidence. |
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nralifer
Optics Apprentice Joined: July/26/2016 Status: Offline Points: 165 |
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Well, finally got around to doing some preliminary loading using the Badlands 155.5 gr Palma bullet we make. Used new Hornady 308 brass, CCI large rifle match primers, and settled on 48 grains of CFE223 with a COL 2.810. Out of my M1A they fed without an issue, had an MV of 2879 fps. That bullet has a G1BC of 0.515, and under standard conditions will stay supersonic to 1300 yds. My gun has a 22 inch barrel and a muzzle brake. Have not shot these for groups yet. The load is 1.5 grain less than the listed minimum in the Hodgdon 2016 Annual Manual. In the manual pressure for the minimum load is 50,900 PSI. Stability at 2880 fps under standard conditions from a 1:11 twist barrel is 1.417
Edited by nralifer - April/23/2017 at 20:58 |
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It is hard to fail, but it is worse never to have tried to succeed. TR
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Sgt. D
Optics Master Extraordinaire Joined: February/20/2008 Location: North Carolina Status: Offline Points: 4525 |
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With that bullet, barrel length and COL try IMR 4895 at 42.7grs and 42.9 or Varget at 43.5 and 43.8 and compare accuracy with the loads you have. Trends show that the groups should be impressive.
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Take care of Soldiers, Show em how its done and do it with em, Run to the Fight & and hold your ground! I die my men go home! If you're a NCO and this ain't you. GET OUT! GOD BLESS AMERICA!
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nralifer
Optics Apprentice Joined: July/26/2016 Status: Offline Points: 165 |
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Will do. What primer and brass do you suggest?
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It is hard to fail, but it is worse never to have tried to succeed. TR
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Sgt. D
Optics Master Extraordinaire Joined: February/20/2008 Location: North Carolina Status: Offline Points: 4525 |
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The primers you are running are fine. Brass is what you are willing to invest. For initial load test I try to stick with fired brass up to 3 loads. After that it goes in the hunting/trigger time bag. New brass (mostly) is not so consistent. For load testing and competitions I run new brass thru case trimming and sizing dies if I am forced to use it in a pinch.
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Take care of Soldiers, Show em how its done and do it with em, Run to the Fight & and hold your ground! I die my men go home! If you're a NCO and this ain't you. GET OUT! GOD BLESS AMERICA!
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nralifer
Optics Apprentice Joined: July/26/2016 Status: Offline Points: 165 |
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Finally have 20 plus once fired cases. Because of potential chamber length differences between military and commercial 308 Win chambers neck sizing the brass as you suggest makes sense. Next round of testing will be with neck sized and trimmed brass. I debarred the flash holes before the first firing.
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It is hard to fail, but it is worse never to have tried to succeed. TR
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Well I got all the parts yesterday and put it together last night. Hopefully I can go shoot it on my lunch break today. They sure a big compared to an AR-15. I need to get a hanging scale so I can weight it.
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BeltFed
Optics Retard Joined: February/12/2008 Location: Ky Status: Offline Points: 22287 |
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What barrel length and weight did you use?
You think that's heavy, try a SASS AR 10 with a 3-15x42 or 3-18x50 and QD mount. |
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Life's concerns should be about the 120lb pack your trying to get to the top of the mountain, and not the rock in your boot.
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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18". Its a mid weight barrel. Though probably on the lighter side.
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
"A Liberal is a person who will give away everything they don't own." |
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BeltFed
Optics Retard Joined: February/12/2008 Location: Ky Status: Offline Points: 22287 |
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After the AR10 SASS, I picked up a DPMS GII Recon AR10 in a gun shop and almost put it on lay-a-way for a new deer rifle. Then I remembered I wasn't planning on hunting that year.
What do you think of the balance of the rifle with and without the suppressor? |
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Life's concerns should be about the 120lb pack your trying to get to the top of the mountain, and not the rock in your boot.
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Its noticeably front end heavy because of that. It weights 16 or 17 ozs, so it adds a whole extra lb right at the end. That part sucks. My other suppressor weights 10oz is 7" long, but it is a 6.5 caliber. This one adds 9 inches to length. I love shooting with suppressors, but hate how much weight and length they add.
The barrel weight was 2lb 10oz If I get to shoot it today, I will try some off hand with on and off and see how much it affects it. |
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
"A Liberal is a person who will give away everything they don't own." |
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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My 308 AR is a 16" and it swings okay with a can (thunderbeast 30P or gemtech 300WM) but isn't nearly as quick as a suppressed SBR. Then again, I am not clearing corners with it, so I can accept it.
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Freedom is something you take.
Respect is something you earn. Equality is something you whine about not being given. |
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Good point. Its purpose will mostly be a utv gun and hunting gun. So it ought to be fine.
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
"A Liberal is a person who will give away everything they don't own." |
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Well I went and shot it and it is a bit under gassed. So much so that it did not run the bolt back at all. And of course I forgot the hex wrench to adjust the gas block. It must be closed up tight. So we will try again tomorrow.
The Elftmann trigger is nice, absolutely no creep and it really does break like a glass rod. |
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
"A Liberal is a person who will give away everything they don't own." |
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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And overlube the bolt.
Sometimes underlubed causes the bolt to grind. |
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Freedom is something you take.
Respect is something you earn. Equality is something you whine about not being given. |
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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Gas block was closed up tight. I turned it out to max and started to shoot, and would turn it in a bit after each shot. It has a detent so it turns 1/4 turn at a time between stops. 4.5 turns out is max. I ended up 2 turns out. There was as definite recoil difference from 4.5 and the 2 turns out. At two turns out it would lock the bolt back on an open mag with the ammo I was using. Federal GMM 175 grain. Once I got the gas blokk adjusted I fired 15 rounds and it functioned perfect.
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Lifetime warranty and excellent customer service don't mean a thing when your gun fails during a zombie attack.
"A Liberal is a person who will give away everything they don't own." |
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sucker76
Optics Journeyman Joined: June/13/2013 Location: Texas Status: Offline Points: 392 |
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Don't you have a gas bypass gas block? I watched a video how to adjust it and I think at 4.5 turns the bypass is closed and the gas port is wide open. More than 4.5 turns should open the bypass.
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Stamp collecting since 2015
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