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Posted: 1/1/2012 8:24:31 AM EDT
I want to build an 18" SPR style AR and was initially looking at 5.56 but it seems there are many superior calibers to be had that will still feed through a standard AR lower. What you would recommend caliber wise that would be efficient out of an 18" barrel and still have long range capability. I would primarily be shooting out to 600 yards, but if I could reach out to 1000, it would be an added bonus.
Link Posted: 1/1/2012 9:03:22 AM EDT
I think about your only choice would be a 6.5G but it would probably do better with at least a 20" barrel.
Your criteria will be difficult to meet out of a standard size AR platform.
Link Posted: 1/1/2012 3:40:25 PM EDT
The 6.5 Grendel will do 600 yds with a good 18" barrel. You could take it to a 1000, if the weather is perfect and the wind isn't blowing. If you want a consistent 1000 yd gun, you might want to look at an AR-10 sized rifle, with a longer barrel. If you can live with 600- 800 yds, an 18" Grendel will do, although a 20" might do better for the longer stuff.

Or so I've been told.

I am going to try my 20" at 1000 though. Just to see if I can do it.
Link Posted: 1/2/2012 9:27:08 AM EDT
[Last Edit: 1/2/2012 9:27:19 AM EDT by LightningII]
mine will be a Grendel or a 6.8 SPCII.
I'm waiting to see what comes along in cheap practice ammo choices, as well as some $$.
Link Posted: 1/2/2012 10:12:11 AM EDT
Grendel. I've shot my 18" grendel at 1000. It does ok, not the best caliber, but it makes it there, tons better than 556.

For 600 and in grendel will do excellent.
Link Posted: 1/2/2012 11:51:45 AM EDT
6.5 Grendel... is the best choice for the 18" SPR...
Link Posted: 1/2/2012 5:53:28 PM EDT
Yep, I was thinking 6.8 or 6.5. 6.8 seems more popular, which makes me think mags, ammo, etc. would be easier/cheaper to accuire.
Link Posted: 1/2/2012 6:36:04 PM EDT
[Last Edit: 1/2/2012 6:38:15 PM EDT by gmtech]
6.8 is a great caliber but does not meet your specs.
It is a 500 yd caliber at best.

If you want 600 - 1000 you would be better off with a .308 but a 6.5 would be a better choice than a 6.8 for that kind of range.

Under 450 I like the 6.8 and it will most likely have better support.

I have two 6.8 and it really shines from a short barrel but I've been thinking about adding a 6.5 G to the stable for longer range.
Link Posted: 1/5/2012 3:12:14 PM EDT
Originally Posted By gmtech:
6.8 is a great caliber but does not meet your specs.
It is a 500 yd caliber at best.

If you want 600 - 1000 you would be better off with a .308 but a 6.5 would be a better choice than a 6.8 for that kind of range.

Under 450 I like the 6.8 and it will most likely have better support.

I have two 6.8 and it really shines from a short barrel but I've been thinking about adding a 6.5 G to the stable for longer range.


I think what i will end up with is either a buy or build of a Grendel or a 6.8 rifle, then just buy/build an upper in the other caliber. There seem to be several really topnotch companies that put out very accurate 6.8 uppers.
Link Posted: 1/5/2012 5:55:04 PM EDT
6.5
Link Posted: 1/5/2012 6:07:34 PM EDT
I like Noveske barrels, and this upper would go on a Noveske lower, which pushes me towards 6.8, since they don't make 6.5 barrels. Perhaps, I'll have to settle for around 600 yards for this build.
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