OpticsTalk by SWFA, Inc. Homepage SWFA     SampleList.com
Forum Home Forum Home > Firearms, Bows, and Ammunition > Firearms
  New Posts New Posts RSS Feed - .308 AR build
  FAQ FAQ  Forum Search   Events   Register Register  Login Login

Visit the SWFA.com site to check out our current specials.

.308 AR build

 Post Reply Post Reply Page  <1234>
Author
Message
sucker76 View Drop Down
Optics Journeyman
Optics Journeyman
Avatar

Joined: June/13/2013
Location: Texas
Status: Offline
Points: 370
Post Options Post Options   Thanks (0) Thanks(0)   Quote sucker76 Quote  Post ReplyReply Direct Link To This Post Posted: April/22/2017 at 23:53
Originally posted by Rancid Coolaid Rancid Coolaid wrote:

Originally posted by sucker76 sucker76 wrote:

Of course we all need multiple AR's because one data point is not a trend.  Big Smile

I'm trying to convince my wife right now that I NEED a tommy gun or else life as we know it will end. 


I have a 40 cal SBR upper, it is great fun. A tommy gun would be fun, why not get a 45 cal upper for an AR?



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. 
Stamp collecting since 2015
Back to Top
Kickboxer View Drop Down
MODERATOR
MODERATOR
Avatar
Moderator

Joined: February/13/2008
Status: Offline
Points: 21307
Post Options Post Options   Thanks (0) Thanks(0)   Quote Kickboxer Quote  Post ReplyReply Direct Link To This Post Posted: April/23/2017 at 10:14
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...
Opinion,untempered by fact,is ignorance.

There are some who do not fear death... for they are more afraid of not really living
Back to Top
sucker76 View Drop Down
Optics Journeyman
Optics Journeyman
Avatar

Joined: June/13/2013
Location: Texas
Status: Offline
Points: 370
Post Options Post Options   Thanks (0) Thanks(0)   Quote sucker76 Quote  Post ReplyReply Direct Link To This Post Posted: April/23/2017 at 14:49
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. 
Stamp collecting since 2015
Back to Top
Rancid Coolaid View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: January/19/2005
Location: United States
Status: Offline
Points: 9238
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rancid Coolaid Quote  Post ReplyReply Direct Link To This Post Posted: April/23/2017 at 16:04
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.
Freedom is something you take.
Respect is something you earn.
Equality is something you whine about not being given.
Back to Top
nralifer View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: July/26/2016
Status: Offline
Points: 165
Post Options Post Options   Thanks (0) Thanks(0)   Quote nralifer Quote  Post ReplyReply Direct Link To This Post Posted: April/23/2017 at 20:45
Originally posted by Sparky Sparky wrote:

Originally posted by nralifer nralifer wrote:

Because I like the 308 so much I want to see how well our bullets work in a semiauto platform. I would like to know what the internal length of your AR10 magazine is. I think the 150 Bulldozer and the 155 Palma Bullet would work well, but need to know what overall length to load these. I have an M1A to use to work up the powder charge.
My Armalite AR10 mags would take an overall length of 2.810. I'd be happy to help you test your semiauto loads for the 308 using my Armalite AR10T. Big Grin

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
It is hard to fail, but it is worse never to have tried to succeed. TR
Back to Top
Sgt. D View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar

Joined: February/20/2008
Location: North Carolina
Status: Offline
Points: 4195
Post Options Post Options   Thanks (0) Thanks(0)   Quote Sgt. D Quote  Post ReplyReply Direct Link To This Post Posted: April/23/2017 at 21:26
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.
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!
Back to Top
nralifer View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: July/26/2016
Status: Offline
Points: 165
Post Options Post Options   Thanks (0) Thanks(0)   Quote nralifer Quote  Post ReplyReply Direct Link To This Post Posted: April/23/2017 at 21:40
Will do. What primer and brass do you suggest?
It is hard to fail, but it is worse never to have tried to succeed. TR
Back to Top
Sgt. D View Drop Down
Optics Master Extraordinaire
Optics Master Extraordinaire
Avatar

Joined: February/20/2008
Location: North Carolina
Status: Offline
Points: 4195
Post Options Post Options   Thanks (0) Thanks(0)   Quote Sgt. D Quote  Post ReplyReply Direct Link To This Post Posted: April/23/2017 at 22:27
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.
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!
Back to Top
nralifer View Drop Down
Optics Apprentice
Optics Apprentice
Avatar

Joined: July/26/2016
Status: Offline
Points: 165
Post Options Post Options   Thanks (0) Thanks(0)   Quote nralifer Quote  Post ReplyReply Direct Link To This Post Posted: April/25/2017 at 06:28
Originally posted by Sgt. D Sgt. D wrote:

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.

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.
It is hard to fail, but it is worse never to have tried to succeed. TR
Back to Top
supertool73 View Drop Down
Optics God
Optics God
Avatar
Superstool

Joined: January/03/2008
Status: Offline
Points: 11497
Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 09:32
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.   


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."
Back to Top
BeltFed View Drop Down
Optics God
Optics God
Avatar

Joined: February/12/2008
Location: Ky
Status: Offline
Points: 19470
Post Options Post Options   Thanks (0) Thanks(0)   Quote BeltFed Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 10:18
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.
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.
Back to Top
supertool73 View Drop Down
Optics God
Optics God
Avatar
Superstool

Joined: January/03/2008
Status: Offline
Points: 11497
Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 10:22
18". Its a mid weight barrel. Though probably on the lighter side.
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."
Back to Top
BeltFed View Drop Down
Optics God
Optics God
Avatar

Joined: February/12/2008
Location: Ky
Status: Offline
Points: 19470
Post Options Post Options   Thanks (0) Thanks(0)   Quote BeltFed Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 10:30
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?
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.
Back to Top
supertool73 View Drop Down
Optics God
Optics God
Avatar
Superstool

Joined: January/03/2008
Status: Offline
Points: 11497
Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 11:02
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. 
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."
Back to Top
Rancid Coolaid View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: January/19/2005
Location: United States
Status: Offline
Points: 9238
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rancid Coolaid Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 11:18
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.
Freedom is something you take.
Respect is something you earn.
Equality is something you whine about not being given.
Back to Top
supertool73 View Drop Down
Optics God
Optics God
Avatar
Superstool

Joined: January/03/2008
Status: Offline
Points: 11497
Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 12:11
Good point. Its purpose will mostly be a utv gun and hunting gun. So it ought to be fine.
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."
Back to Top
supertool73 View Drop Down
Optics God
Optics God
Avatar
Superstool

Joined: January/03/2008
Status: Offline
Points: 11497
Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 16:22
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. 
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."
Back to Top
Rancid Coolaid View Drop Down
MODERATOR
MODERATOR
Avatar

Joined: January/19/2005
Location: United States
Status: Offline
Points: 9238
Post Options Post Options   Thanks (0) Thanks(0)   Quote Rancid Coolaid Quote  Post ReplyReply Direct Link To This Post Posted: April/26/2017 at 19:07
And overlube the bolt.

Sometimes underlubed causes the bolt to grind.
Freedom is something you take.
Respect is something you earn.
Equality is something you whine about not being given.
Back to Top
supertool73 View Drop Down
Optics God
Optics God
Avatar
Superstool

Joined: January/03/2008
Status: Offline
Points: 11497
Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: April/27/2017 at 16:36
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.       
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."
Back to Top
sucker76 View Drop Down
Optics Journeyman
Optics Journeyman
Avatar

Joined: June/13/2013
Location: Texas
Status: Offline
Points: 370
Post Options Post Options   Thanks (0) Thanks(0)   Quote sucker76 Quote  Post ReplyReply Direct Link To This Post Posted: April/28/2017 at 13:09
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. 
Stamp collecting since 2015
Back to Top
 Post Reply Post Reply Page  <1234>
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 12.01
Copyright ©2001-2018 Web Wiz Ltd.

This page was generated in 0.314 seconds.