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Discussion in 'The Snipers Nest' started by Tailhunter, Dec 8, 2016.
For accurate work out to 600
Calling John Boyette....he and I have actually been having this discussion over the past couple days. I would think (there I go thinking again) a SS or otherwise precision barrel (Lilja, Douglas, etc) in 18" or 20" would be the way to go; or even a set up like a recce with the 16" Lilja barrel.
That said...John had me pinging steel at 550 yards with my 16" DD M4 with Aimpoint ACO and he says if I just get a better optic (i.e., magnified) I could use that rifle for precision shooting to 600 yards.
I suppose that depends on how far up you want to aim... The physics involved are trading off bullet speed for barrel stiffness. I personally like'em long but any of those lengths is fine.
If you're looking for an excuse to build another upper then I say an 18" with quality barrel will do you just fine
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Depends on the barrel manufacturer more than anything else. If buying new then 18" with rifle length gas.
I had an 18" rainier arms but couldn't get it to group worth a flip.
Do you know it was a barrel issue? That's unusual with Ranier's barrels. If you are willing to spend a bit, try Lilja, Douglas, Compass Lake, Criterion, or less expensively, a BCM SPR barrel or Faxon.
Edited to add, the Navy-spec'd recce had a 16" Lilja that was excellent. There are many excellent choices for 16" as well.
How many different brands or weights of ammo did you try? I am no marksman or expert on anything, but I just tried 7 different weights between 5 brands and had one combo that was pretty good while a few were ok and a few were all over the place.
All kinds of everything.
Yeah, I just saw your thread under this one. Like the name says, I'm pretty simple. I have collected up some rifles over the last couple years and I'm just now starting to use them. I really had no idea a 69gr brand x would group so much better than 55, 62, 64, 75 and 77gr brands a b and c out of the same rifle.
So I have ran 12", 14.5" 16", 18", 20", 24" all in .223/5.56 ar platforms.
Barrels that are longer do a Avg of 50fps per inch. Toping out at about 30"
All the listed sizes would/could do Sub-MOA at 600yds. 16" and under the 600yd line is the end of quality groupings.
18" falls off at 900yds, 24" falls off at 1100yds
But wind is a bitch past 500 yds so is energy transfer. With that typed I dunked a dude at 920yds with a M16A4 accurized by the AMU with a 2.5-8x MK4 and mk262.
So yes it works, my 18" CLE is my most trusted and fun rifle. Busting cantaloupe at 900yds with 77gen SMK is easy.
Cool. I've read a lot of things from range experts and techy guys that say barrel length is over rated at a certain point. It is nice to see a real world guy back it up.
Hope to mount the scope on my newst 18" acquisition tomorrow.
Rainier barrels are great. I have a 14.5 that shoots very well. I think I found the problem today on the accuracy issue. Gas block striking the hand guard.
Glad you diagnosed it. So often the little things.
Started by removing one thing at a time.
You could always get a bolt gun for accuracy at 600.
It may have been one of their mid line models made by blackhole weaponry. I had all sorts of accuracy problems with multiple barrels of theirs.
Rainier Arms Rock Creek
Any gun I shoot or rather I own is sub moa at any given distance. 1,000yds 8" etc and below. I'm not in my prime Army Ranger/Sniper days so I opt for my time and money on the larger center fire rounds. With that said it's all in your goals. Are you reloading or buying factory ammo?
Think of a snub nose vs a 4.75" barrel and see the grouping at just 25yds.
My next .308 build is getting a 30" barrel.........
Reload, haven't bought factory ammo in years.
Both guns shoot sub moa at 100.
The 18" has printed under a half and the 14.5" just under 3/4.
So they should be under moa even if the stars don't align.
Goals. I really don't need anything past 600 but it might be fun.
I have a .308 that shoots good and it can take care of the bigger animals at longer distance.
I also have had an itch for a dmr/spr build. From what I've been reading, there is an average difference of 75 fps from 18" to 20". I'm leaning towards the 20". Also for shooting 77's, anyone ever notice a difference between 1:7 and 1:8 twist with those projectiles?
To be honest,
If I ever build another, it'll be a twenty inch, 1/7
At the first Wheaton Arms match last year, a number of us ran .223's. It's mostly fairly close, 500 and under, but the longest target was around 930. I hit it with a 20", my shooting partner hit it with an 18", and the other guy hit it with his 16". It's not as easy with a shorter barrel, but a 16" is easily capable of 600.
My next one will be 18" rifle length, I like that length best for precision work.
ColbyJack, you shouldn't see any difference in those two twist rates with 77's. They will both stabilize it.