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Posted: 5/26/2008 9:26:06 AM EDT
I would like to build an AR platform for taget shooting out to 500-600 meters. What do you guys think would be the most acurate round that can be built on an AR15 lower. I have done some reloading in the past, 9mm, .40 and .45, so I am ok with reloading although I dont want to only reload the ammo.

I fould this picture in another post by Big_Bullseye and is along the lines of what I want to build.



Link Posted: 5/26/2008 9:59:50 AM EDT
6.5 Grendel, 6mmAR, or .223 (with fast twist for heavy bullets on .223).

That's just my opinion, but I don't think you can do better out of an AR-15 platform than the Grendel for long range target shooting.

Link Posted: 5/26/2008 10:10:30 AM EDT
6mm WOA also
Link Posted: 5/26/2008 10:25:34 AM EDT
What about 6.8 SPC?
Link Posted: 5/26/2008 4:12:27 PM EDT

Quoted:
6.5 Grendel, 6mmAR, or .223 (with fast twist for heavy bullets on .223).

That's just my opinion, but I don't think you can do better out of an AR-15 platform than the Grendel for long range target shooting.



+1
Link Posted: 5/26/2008 6:54:11 PM EDT
This subject came up on another thread in GD and I got to thinking...


You want something that will shoot 600 yards easy out of an AR-15 platform?

Lapau makes a bullet called the 100gr Scenar.  This bullet has a BC of .444

 The Grendel should shoot it at about 2700fps or more, depending on barrel link.  

By the time this bullet makes it to 600 yards, it is still going to be cooking along at 1624 fps, with an 87" drop.

Link Posted: 5/26/2008 7:46:02 PM EDT
Link Posted: 5/26/2008 8:38:55 PM EDT
out to 600 any thing from the 223 , 6mmWOA,  6.5 Grendel, and 6.8 SPC will do that
Link Posted: 5/27/2008 1:50:14 PM EDT

Quoted:
out to 600 any thing from the 223 , 6mmWOA,  6.5 Grendel, and 6.8 SPC will do that


I know a 223 can handle it, I shoot high power. I was looking more alnog the lines of a "tack driver". It sounds like 6.5, 6.8 are the way to go. How is the avaliblity of factory ammo? Prices? thanks again for the info!!!
Link Posted: 5/28/2008 6:08:10 AM EDT
I do not have either but I did a lot of research before I bought a 450 bm.
the 6.8 and 6.5 were contenders because I was looking for a deer hunting round.  
The 6.5 is available from wolf and it is priced right I'm not sure about other sources.
The 6.8 is available through many manufacturers, including Remington not sure on price.  For a tack driver the 6.5 should be best at distance, from my research because of the better BC.  
Link Posted: 5/28/2008 6:12:29 AM EDT
.243 WSSM

Nasty velocity if needed (over 3000 fps with a 100grn round), plenty of light weight varmit bullets, and factory loaded ammo on most major sporting good stores shelves.  It's an all around performer...
Link Posted: 5/29/2008 5:33:01 AM EDT
If you're looking to shoot mag length ammo at 600yds, then the 6mmAR would probably be my choice.  If single fed ammo will do, the 6mm WOA is a more cost effective solution given the difference in price of the parent 6.8 SPC case vs. the Lapua made 6.5 Grendel.

Either will shoot knots...

I went with the 6mmWOA and now have a spacegun for High Power competition as well as a flattop 20" critter gun.

ETA:  Obviously neither of these wildcats enjoy factory commercial loading, but both are easily made by running a case through a sizing die.
Link Posted: 5/29/2008 5:58:07 AM EDT
I am generally in the 6.8SPC corner, but to answer you with total honesty, with regard to your question word of word;
(I would like to build an AR platform for target shooting out to 500-600 meters.)
I would go with a 6.5 Grendal for this mission statement.

Both the Grendal and the 6.8 SPC are expensive to shoot if you don't handload.  So I would absolutely load my own if I were you.
Remember that you may or may not get a factory load to shoot to the rifles potential, and neither one has a lot of options for you. Any rifle that has a dedicated mission of target work at 500-600 is going to best with handloads if for no other reason than the cost of ammo.  Shooting more makes you a good marksman.  Not buying more.
Ammo cost is a key to the mission in every instance except those of the very wealthy.
Link Posted: 6/5/2008 6:01:19 AM EDT
height=8
Quoted:
.243 WSSM

Nasty velocity if needed (over 3000 fps with a 100grn round), plenty of light weight varmit bullets, and factory loaded ammo on most major sporting good stores shelves.  It's an all around performer...


Agreed. I friend has one of these, and on varmints, it is NASTY! Will probably be my next upper.
Link Posted: 6/6/2008 9:02:01 AM EDT
I ordered the .300 SAUM and Have seen some 150 grain reloads from a website rated at 3,550 feet per second. I bought that gun and havent even broken it in yet, but @ a $1.80 a shot....I dunno. But check it out. Ill find that website and post it later. Its not nosler, but its one similar.
Link Posted: 6/6/2008 10:08:22 AM EDT

Quoted:
I ordered the .300 SAUM and Have seen some 150 grain reloads from a website rated at 3,550 feet per second. I bought that gun and havent even broken it in yet, but @ a $1.80 a shot....I dunno. But check it out. Ill find that website and post it later. Its not nosler, but its one similar.


I think he's wanting to run a standard AR lower, not a AR-308 lower.  The AR-308 increases the number of choices, as well as the cost, substantially.  260 REM comes to mind through and AR-308, but then that appears to be another topic.

-David
Edgewood, NM
Link Posted: 6/6/2008 11:13:11 AM EDT
I've shot high 190s with more than ten Xs at 600yrds with my service rifle. Compaslake prepared Douglass XX 1/8 barrel, Wylde chamber, Sierra 80g, US mil pulldown case, BR4, 25.3 VVN140. The two shooters I know that were testing the little cartridge 6.Xs both moved up to .243s, the 'perfect cartridge'.

FWIW
Link Posted: 6/6/2008 4:34:25 PM EDT
KKF 6mm/30Rem, which I concocted some 15 years ago:

Not a new idea. I'll post a pic of an upper.


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