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View Full Version : AR in a caliber other than 5.56...


ExtremeX
05-28-2012, 7:30 PM
I know the platform has many available caliber which can be had.

If you could pick 1 additional caliber aside from 5.56 what would it be and why?

Please exclude the .22 LR from this debate.

MiddleKingdom
05-28-2012, 7:37 PM
I think I'd consider 7.62x39 because it's the most affordable .30 cal to shoot. I don't reload yet so I'm actually researching the practicality of getting a 7.62x39 upper.

Dreaded Claymore
05-28-2012, 7:40 PM
I'm not sure which one I'd want, personally. 5.45x39mm for cheap plinking? 9x19mm also for cheap plinking? 6.5mm Grendel for a tacticool gun? I can't decide.

justjeff
05-28-2012, 7:44 PM
6.8 spc I absolutely love it. I have taken 30+ Hog's in Texas and shot my San Diego Deer with it.

What I don't like is: use's different bolt then 223/556, no pmags, ammo is pricey and hard to find on short notice.

NSR500
05-28-2012, 7:48 PM
5.45x39

Intimid8tor
05-28-2012, 7:49 PM
I have them in 9mm, 7.62x39 and 6.8. I shoot the 7.62 most followed by the 9mm.

fourtraxmc
05-28-2012, 7:56 PM
I just ordered a 6.8 and it is my first AR build. Hopefully I didn't make a mistake(seriously don't think so) !

Josh3239
05-28-2012, 7:57 PM
.50BMG, so much power and so much fun. Cheapest .50BMG option I am aware of. If I cannot take that one I'd choose the AR10 because the .308 round is an awesome perfromer and I am all set up to reload it. If it has to be in the AR15 family then maybe the 300 AAC Blackout. It is intriguing round, cheap ammo, easy to reload, compatible with most AR parts, shows some good accuracy potential, good amount of penetration, and works great with a suppressor.

CSACANNONEER
05-28-2012, 7:58 PM
I've only got 2 other calibers. Since you've excluded .22lr, I'm going to have to go with 50BMG.

Lagduf
05-28-2012, 8:07 PM
I would get an AR in 9mm using a lower capable of accepting Glock mags.
If we could get SBR's in CA I'd get one in 300 Blackout and suppress it (oh wait - can't do that either :()

I'd like an AR10/308.

ExtremeX
05-28-2012, 8:11 PM
I guess ill spill my beans now...

Ive been looking at either the 6.8 SPC or the 6.5 Grendel for my next upper. My primary focus is target shooting; Ive taken my 5.56 to around 500 and 600 yards with satisfactory results out of a varmint style 24" upper. At those distances I find my ammo selections to be more of a limiting factor than my hardware.

Ive also considered the 7.62x39 and 5.45 cartridge but I ended up just getting a Saiga rifle for less than an upper would have cost me. I decided not to pursue the AR platform in these cartridges for that reason alone.

Ive been interested in the 300 Blackout but seems its not really worth considering unless you can run suppressed and from what I read the ballistics are not as good in comparison to the 5.56, 6.8 or 6.5. I have not seen hard data on ballistics so someone correct me if I am wrong.

Bhobbs
05-28-2012, 8:13 PM
.338 Lapua Mag.

shadowofnight
05-28-2012, 8:18 PM
I guess ill spill my beans now...

Ive been looking at either the 6.8 SPC or the 6.5 Grendel for my next upper. My primary focus is target shooting; Ive taken my 5.56 to around 500 and 600 yards with satisfactory results out of a varmint style 24" upper. At those distances I find my ammo selections to be more of a limiting factor than my hardware.

Ive also considered the 7.62x39 and 5.45 cartridge but I ended up just getting a Saiga rifle for less than an upper would have cost me. I decided not to pursue the AR platform in these cartridges for that reason alone.

Ive been interested in the 300 Blackout but seems its not really worth considering unless you can run suppressed and from what I read the ballistics are not as good in comparison to the 5.56, 6.8 or 6.5. I have not seen hard data on ballistics so someone correct me if I am wrong.

I went with a 260 Remington AR to get more reach ( My 458 Socom AR is just for short range fun ) , just because 75% of my shooting/reloading lately has been for my bolt 260 Remington.

I was thinking about the 6.5 Grendel, but I have tons of 260 Remigton brass and like the 260 cartridge enough to justify making the 308 platform AR.

ExtremeX
05-28-2012, 8:21 PM
I would get an AR in 9mm using a lower capable of accepting Glock mags.
If we could get SBR's in CA I'd get one in 300 Blackout and suppress it (oh wait - can't do that either :()

I'd like an AR10/308.

I'm mainly looking at the AR-15 platform since I have a couple lowers already. Instead of re-inventing the wheel I figure I should take advantage of the platform and add a couple extra uppers which would interest me. One of which would be a dedicated .22 LR upper which is why I excluded it from the debate.


I like the AR-10 very much, but I bought a Remmy 700 bolt gun in hopes it would cure my itch for the AR-10 / .308 rifle. I will be reloading for .308, bolt gun is nice since I don't have run around picking up brass.

9mm is pretty interesting too since its my primary pistol caliber and I do buy it in bulk already. I'm not sure if the 9mm would be more of a toy a serve a practical purpose? I would however consider it in a AR pistol as it burns more efficiently than the 5.56 in a short barreled upper.

bighead
05-28-2012, 8:26 PM
I just shot 400 rds thru my 5.45 ar today.All the exotic and more expensive calibers are nice to talk about on the internet but if you actually want to shoot, and shoot alot buy your ammo by the crate.I pay $278 for 2200 rds shipped.

Exposed
05-28-2012, 8:28 PM
Love my 7.62x39 AR. I shoot it more than my 223/5.56 AR.

Jicko
05-28-2012, 8:31 PM
AR15 platform - 300AAC

Or AR10 platform - 7.62/.308 pretty perfect as it is...

ExtremeX
05-28-2012, 8:43 PM
AR15 platform - 300AAC

Or AR10 platform - 7.62/.308 pretty perfect as it is...

Can you explain your reasoning for the 300AAC? What advantage do I get from this caliber considering I cant run suppressed?

I don't want to own something just to own it. There needs to be a reasonable advantage for an application for me to even consider it.

ExtremeX
05-28-2012, 8:46 PM
I just shot 400 rds thru my 5.45 ar today.All the exotic and more expensive calibers are nice to talk about on the internet but if you actually want to shoot, and shoot alot buy your ammo by the crate.I pay $278 for 2200 rds shipped.

I will be reloading for my larger and more exotic calibers. Retail match ammo for .223 cost me $1 bullet, around the same for .308. If I am going to pay that for the AR platform I just rather spend it on a caliber like 6.8 or 6.5 if I can actually see a long range benefit from the AR-15 platform. My goal to a degree is to have a smaller light weight setup which can reach out should I choose one of these cartridges.

shoebox56
05-28-2012, 8:50 PM
9mm upper would be nice. Can shoot in practically any indoor range. The round is decent enough for HD. Three designs to choose from: Olympic Arms, Colt variant, and direct impingement from RMW should be out soon.

Quinc
05-28-2012, 8:52 PM
458 Socom. Something about being able to bump fire 700gr bullets sounds amazing. Just to bad its damn near impossible to find brass...

ExtremeX
05-28-2012, 9:02 PM
458 Socom. Something about being able to bump fire 700gr bullets sounds amazing. Just to bad its damn near impossible to find brass...

The 458 Socom is pretty sweet too. I like that cartridge, heavy hitting for sure.

guitar-nut
05-28-2012, 10:36 PM
I'd love to have a 6.8spc upper for deer/hog hunting. It's on my "some day" list after I finish my 5.56 build.

FFShooter23
05-28-2012, 10:37 PM
300 blackout doesn't have to run suppressed. I use a 16" wilson combat barrel and load supersonics. Advantage of 300blk, keep everything in your AR, except the barrel, the same. There are also wide variety of bullets you can use and they are easily accessible.

NorCalK9.com
05-28-2012, 10:53 PM
Im gonna go with 458socom. I had it and it was AWESOMO! But very expensive.

DannyInSoCal
05-28-2012, 10:57 PM
I went with the 6.8SPC II -

It splits the difference between 5.56/.223 and 7.62/.308 -

In performance and ammo cost/availability.

Plenty of 6.8/.270 ammo choices -

And it's a great boar/deer/big horn round.

Plus it's fun to knock down targets everyone is just ringing....

socal425
05-29-2012, 10:09 AM
300 blackout doesn't have to run suppressed. I use a 16" wilson combat barrel and load supersonics. Advantage of 300blk, keep everything in your AR, except the barrel, the same. There are also wide variety of bullets you can use and they are easily accessible.

+1

From 300BlkTalk Forum:
"Compatibility with standard AR magazines, much more available ammo, support from about 60 companies (at the time of this writing), SAAMI standards, subsonic capability, military interest, the ability to work with the widest range of bullet weights, and less expensive brass and ammo."

Just finished building my 300BLK with a 16" CMMG WASP finish barrel. Nice having the ability to run with all standard AR parts including Pmags. Doesn't need to be suppressed if using supersonic loads. Will be reloading as well with resized 5.56 brass. :D

BigBamBoo
05-29-2012, 10:13 AM
Since you mentioned shooting longer rangers..... www.6mmAR.com

Jason_2111
05-29-2012, 10:16 AM
300 blackout doesn't have to run suppressed. I use a 16" wilson combat barrel and load supersonics. Advantage of 300blk, keep everything in your AR, except the barrel, the same. There are also wide variety of bullets you can use and they are easily accessible.

I did the same thing.
At the end of the day, more F-U power for CQB/Home Defense, reloading the ammo is almost exactly the same cost as 5.56.... close enough to not matter.
I'd love a 6.8, but with the amount that I shoot, it's just not financially do-able. ;)

Since the 300BLK runs better in a shorter barrel, I'm planning a pistol build in 300BLK.

The War Wagon
05-29-2012, 10:53 AM
.22LR.

And I already built one. :D


http://i212.photobucket.com/albums/cc305/The_War_Wagon/100_7631.jpg
http://i212.photobucket.com/albums/cc305/The_War_Wagon/100_7624.jpg

Dreaded Claymore
05-29-2012, 2:03 PM
There's definitely room in the market for a really big cartridge like .450 Bushmaster, .458 SOCOM, or .50 Beowulf. But what I can't figure out the existence of all three at the same time. Why did the cartridge get invented three times?

Edit: Never mind, I just looked it up. The .458 SOCOM was designed because there were lots of bullets available in that diameter, and the case was designed to fit in STANAG magazines without modification.

tacticalcity
05-29-2012, 2:30 PM
Probably not what you are asking, but .308. A completely different lower but still an AR platform. Would not be inplace of the 5.56mm AR, but in addition to it. Would round out my collection nicely. If it had to be the same lower then a 300 Blackout. Not because I buy into the crap about the 5.56mm, but because I can get a really nice deal on a KAC upper in the 300 Blackout at the moment and it looks pretty darn sexy. More than likely, however, if I were to build another AR it would be another 5.56mm AR with a KAC upper.

EvoXRiley
05-29-2012, 3:31 PM
5.45x39 effective round for SD and cheap to stock pile, works with Pmags no problem!

corcoraj2002
05-29-2012, 3:40 PM
6.8 spc I absolutely love it. I have taken 30+ Hog's in Texas and shot my San Diego Deer with it.

What I don't like is: use's different bolt then 223/556, no pmags, ammo is pricey and hard to find on short notice.

+1 I am currently building a 6.8 spc upper and hope to at least take it out hog hunting this season.

Capybara
05-29-2012, 3:54 PM
9mm is cheap, fun and excellent for under 100 yard plinking.

5.45 seems like a smart way to go if you like .223/5.56 but are just not wanting to pay .39 a round to shoot.

7.62 is pretty good as well if you want something with a bit more oomph but still cheaper than 5.56.

I will opt out of commenting on any of the other rounds mentioned here as I have zero experience with any of them.

Quinc
05-30-2012, 7:33 AM
( My 458 Socom AR is just for short range fun ) AR.


When are you going to start a thread on reloading for the .458 and where to find brass cheap bullets etc? :D

Agent Tikki
05-30-2012, 10:02 AM
.300 blackout for shorter barrels (pistols) short distance hunting, best choice for minimizing costs for the conversion.

6.8 spc for short to intermediate range hunting, does well with shorter barrels too. Great round if you want a maximum 16" barrel.

6.5 Grendel, .264 lbc for short to intermediate range hunting or long distance target shooting (800-100 yards) does especially well with longer barrels.

hkusp
05-30-2012, 10:18 AM
.22LR.

And I already built one. :D


http://i212.photobucket.com/albums/cc305/The_War_Wagon/100_7631.jpg
http://i212.photobucket.com/albums/cc305/The_War_Wagon/100_7624.jpg

That rules! Can you tell us the specs on that upper?

chead
05-30-2012, 10:57 AM
9mm is excellent. I have one that might go up for sale soon. Keep your eyes peeled! :)

ouch1
05-30-2012, 12:03 PM
I would go with a .243WSSM. It has ballistics that are close to the .30-06 in a AR-15 platform, and at standard 30rnd mag holds 10 WSSM rounds with minor mods.
http://olyarms.net/index.php?page=shop.product_details&flypage=flypage.pbv.v8.tpl&product_id=104&category_id=76&option=com_virtuemart&Itemid=5

-ouch1

The War Wagon
05-30-2012, 12:17 PM
That rules! Can you tell us the specs on that upper?

Tactical Solutions M4-style dedicated .22 upper. I knocked the FSB off (BE CAREFUL - it's LOC-TITED on!!!), and added an Airsoft ARMS M41B folding front sight base!

The .22 doesn't use a gas tube, so there's no need to go to the expense of a REAL ARMS sight (which will run you about $158 before tax and shipping! :eek:), so I went the replica route, for $35! This is one of those RARE moments, where you can ACTUALLY cut a corner, and get away with it!

That IS a REAL DD Omega 12.0 FSP set of rails though - got those used off another board's gear exchange. Magpul AVG, and a TacticalLink 2pt. sling and rail mount (OVERKILL on the sling, but I'd just sold the rifle it came off of, and figured I'd just stick it on here :o).

Precision Aero complete lower and Ace ARF-X stock were likewise purchased as a complete unit off another board. TacSol rifles need FULL hammer, NOT notched ones, so while I had both the A-P lower, and a spare Colt 6920 laying around at the time, the A-P got the call on this project.

REAL Aimpoint Comp M (1 - the FIRST Comp) in a QRP mount, BTW.

pinoy916
05-31-2012, 1:18 AM
Got rid of my LWRC 6.8, it did not justify the price of ammo.

I would say I that i still love the good ol' 5.56/.223 and 7.62x39 in the AR platform, this ammo is everywhere. I gues the .308 is in this category too.

Another great one would be the .416 BARRETT and the .338

CHECK MY .458 SOCOM LINK BELOW!!

loosewreck
05-31-2012, 1:25 AM
9mm- this way I can shoot it at indoor ranges and ammo is pretty cheap.

If ranges would let us shoot the stuff here around LA, I'd get 5.45x39- just amazing deals on the stuff.

chead
05-31-2012, 8:41 PM
I've got a 9mm kit up for sale in the market place (see sig). It's been good to me.

FX-05 Xiuhcoatl
05-31-2012, 8:52 PM
300 ossm 30-06 knock down power out of a ar15
will post a link when I get home

Sniper3142
05-31-2012, 9:08 PM
I've been planning on getting a 6.5 Grendel/.264LBC upper for a while now but haven't to see if anything interesting develops.

I wasn't impressed with the ballistics of the 6.8SPC II... until now.

http://www.ssarmory.com/6.8_spc_ammo_140gr_VLD_Berger.aspx

:D

These 140Gr VLD projectiles have a BC of .487 and are still be supersonic @ 1,000 yards out of a 16 inch barrel!

I've decided to get off the fence and go with a 6.8 SPC II.

Zartan
06-01-2012, 4:30 AM
Once this .22 build is done, I'm going 9mm.

Quinc
06-01-2012, 2:51 PM
How about in .177 pellet.
http://www.accurateshooter.com/featured/ar15-177-air-rifle-conversion-upper/
http://accurateshooter.net/Blog/crosman177.jpg

shadow65
06-01-2012, 3:51 PM
I like two calibers beside the 5.56 in an AR platform.
.22LR and the 300 BLK
http://www.hunt101.com/data/500/medium/300_Blackout_004.JPG
http://www.hunt101.com/data/500/medium/300_Blackout_011.JPG

707electrician
06-01-2012, 4:14 PM
I'd like one in 6mmAR and an AR10 in .260 and if I could have a SBR I would do a 9mm

The Right to Bear Arms
06-01-2012, 5:47 PM
I'd choose the AR10 because the .308 round is an awesome perfromer and I am all set up to reload it.

This would be my answer. Especially, since I have the .308 as part of my Long Gun platform. Although, it's popular consensus that both Long Gun and Battle Rifle categories should have their own dedicated ammo stockpile. I like the idea of having 2 categories served by 1 caliber.

DarkSoul
06-01-2012, 6:16 PM
I just recently built a 300 Blackout and love it. Most of my shooting is under 100 yards at steel plates and such. It's very accurate out to about 300 yards with the right ammo, and the beauty there is that there are dozens of bullets available to shoot both sub and supersonic.

I reload my ammo, and am currently reloading with range pickup brass for .18 per round using milsurp 147g slugs and shooting at about 1850fps. It hits approximately 30% harder thana 5.56 according to the data at aac300.com

chiz_65
06-01-2012, 7:47 PM
When are you going to start a thread on reloading for the .458 and where to find brass cheap bullets etc? :D

+1 :iamwithstupid: I'm just about finishing my 458 build and would love to learn to reload this round. SBR Ammunition has a reloading service where you send them your brass and they do all the grunt work (about $1.54 per basic round).

hummveecop
08-09-2012, 3:24 AM
Just finishing a 24" EHB build in .223. Next acquisition will be either a Chiappa upper in .22LR for practice, or another HB build upper in 7.62 x 39 - just don't shoot corrosive ammo in a DI system.

sharxbyte
08-09-2012, 6:43 AM
7.62x39:D

bonesurf
08-09-2012, 6:48 AM
I have a 9, .22lr and .300blk aside from 5.56. The 9 is a lot of fun and may actually be my favorite plinker.

someR1
08-09-2012, 8:30 AM
5.45x39 = cheap amazing fun !

Good luck finding one right now ...

sffred
08-09-2012, 9:10 AM
6.8spc or 7.62x51 for power long shots, but 300blk, and 7.62x39 seem to be the new big thing!

Quinc
08-09-2012, 9:12 AM
+1 :iamwithstupid: I'm just about finishing my 458 build and would love to learn to reload this round. SBR Ammunition has a reloading service where you send them your brass and they do all the grunt work (about $1.54 per basic round).

I am currently in the 3month waiting period for my RRA 458 upper. :(

Also Brownells has brass in stock! =)

someR1
08-09-2012, 9:24 AM
I am currently in the 3month waiting period for my RRA 458 upper. :(

Also Brownells has brass in stock! =)

shoulda got the beo :D

Quinc
08-09-2012, 12:39 PM
shoulda got the beo :D

458 has a larger bullet selection and should be cheaper to reload for. ;)


I wouldn't have minded having straight walled brass though. :o

04slogoat
08-09-2012, 12:44 PM
.45?