texashuntingforum.com logo
Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
TraeMartin, Beatixre, MooseSteed, Trappernewt, casyoo
71987 Registered Users
Top Posters(All Time)
dogcatcher 110,788
bill oxner 91,416
SnakeWrangler 65,416
stxranchman 60,296
Gravytrain 46,950
RKHarm24 44,585
rifleman 44,461
Stub 43,768
Forum Statistics
Forums46
Topics536,990
Posts9,719,208
Members86,987
Most Online25,604
Feb 12th, 2024
Print Thread
6.5 creedmoor AR10 barrel length #5782984 06/10/15 08:24 PM
Joined: Mar 2014
Posts: 978
E
el_cazador713 Offline OP
Tracker
OP Offline
Tracker
E
Joined: Mar 2014
Posts: 978
Going to build an AR10 in 6.5 creedmoor. Debating on going with a 18 or 20" barrel. Barrel will be threaded for future suppression. Any suggestions or experiences? Thanks

Re: 6.5 creedmoor AR10 barrel length [Re: el_cazador713] #5782986 06/10/15 08:27 PM
Joined: Jan 2007
Posts: 26,127
KRoyal Online Sleepy
Texoma Legend
Online Sleepy
Texoma Legend
Joined: Jan 2007
Posts: 26,127
I'm no expert on the 6.5CM, but from what I've read on here and other places people say not to go below 24" on the 6.5CM

I have no idea how accurate that is, but that is what I've gathered on the subject.


[Linked Image]



Re: 6.5 creedmoor AR10 barrel length [Re: KRoyal] #5782993 06/10/15 08:33 PM
Joined: Aug 2012
Posts: 15,539
T
TexFlip Offline
THF Celebrity
Offline
THF Celebrity
T
Joined: Aug 2012
Posts: 15,539
Originally Posted By: KRoyal
I'm no expert on the 6.5CM, but from what I've read on here and other places people say not to go below 24" on the 6.5CM

I have no idea how accurate that is, but that is what I've gathered on the subject.

Bull butter. Mine's 16.25"
I'd go as short as I could if it's for hunting.


Originally Posted by unclebubba
Just to make sure that it is done thoroughly, I go both ways.

Re: 6.5 creedmoor AR10 barrel length [Re: el_cazador713] #5782998 06/10/15 08:34 PM
Joined: Sep 2009
Posts: 18,907
C
ChadTRG42 Offline
THF Celebrity
Offline
THF Celebrity
C
Joined: Sep 2009
Posts: 18,907
The 140 grain bullets will run 2760- 2800 fps in a 24" bolt gun. You will lose about 80-100 fps going to a gas gun, plus the ~25 fps per inch. So a 20" should run about 2600 fps with a 140 grain. The CM makes a good AR-10 round.


[Linked Image]
Custom and Precision Ammunition!!
https://DallasReloads.com/
Type 01 and Type 06 FFL
Re: 6.5 creedmoor AR10 barrel length [Re: el_cazador713] #5783043 06/10/15 09:05 PM
Joined: Jul 2011
Posts: 672
G
glb1955 Offline
Tracker
Offline
Tracker
G
Joined: Jul 2011
Posts: 672
I just completed my 6.5 CM AR build. I used a JP barrel and it is 22". Very accurate rifle.

g

Re: 6.5 creedmoor AR10 barrel length [Re: el_cazador713] #5783061 06/10/15 09:15 PM
Joined: Jan 2007
Posts: 26,127
KRoyal Online Sleepy
Texoma Legend
Online Sleepy
Texoma Legend
Joined: Jan 2007
Posts: 26,127
Lol see told you I don't know what I'm talking about when it comes to 6.5CM.

I'm wondering what the 6.5CM has over the 308 in shorter barrels? I'm guessing the bullets have better BC than the 30 cal bullets? Out of my 16" gas gun I get 2510 average FPS. If you were to shorten the 20" down to 16" you'd be sitting right around 2500 FPS as well. I thought the big selling point for the 6.5CM was it's speed which made it very flat shooting. Again I have no clue about 6.5CM so please teach me LOL.


[Linked Image]



Re: 6.5 creedmoor AR10 barrel length [Re: KRoyal] #5783072 06/10/15 09:22 PM
Joined: Jul 2010
Posts: 1,320
C
Crews Offline
Pro Tracker
Offline
Pro Tracker
C
Joined: Jul 2010
Posts: 1,320
Originally Posted By: KRoyal
I'm guessing the bullets have better BC than the 30 cal bullets?


you guessed correctly

Re: 6.5 creedmoor AR10 barrel length [Re: el_cazador713] #5783173 06/10/15 10:29 PM
Joined: Jan 2007
Posts: 3,410
T
Tye Offline
Veteran Tracker
Offline
Veteran Tracker
T
Joined: Jan 2007
Posts: 3,410
I would suggest 22" on the barrel. I built one last year and love it. My rifle will shoot 1/4-1/2 MOA all day long. I went and shot 60 rounds this am. Here is a silhouette I was shooting at 1012 yards. The 4 shot group at the bottom right is mine. The others were from a 260 that a guy was shooting next to me.

I hand load and use 140 grain Amax bullets in front of 41 grains of H4350. The bullets are running around 2650 fps with this load. You can't push the 140s as hard in a gas gun. I ended up using a JP high pressure bolt and carrier, SLR gas block and a rounded JP ejector to minimize swipes.



These are from a few months ago just short of 1000


100 yard load development

Last edited by Tye; 06/10/15 10:33 PM.

Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.
Re: 6.5 creedmoor AR10 barrel length [Re: ChadTRG42] #5783196 06/10/15 10:42 PM
Joined: Dec 2008
Posts: 41,083
J.G. Online Content
THF Celebrity
Online Content
THF Celebrity
Joined: Dec 2008
Posts: 41,083
Originally Posted By: ChadTRG42
The 140 grain bullets will run 2760- 2800 fps in a 24" bolt gun. You will lose about 80-100 fps going to a gas gun, plus the ~25 fps per inch. So a 20" should run about 2600 fps with a 140 grain. The CM makes a good AR-10 round.


This.

And shortening a barrel does not degrade consistency in a rifle barrel. You lose velocity, but you also reduce the sine wave of the barrel making the powder charge node wider. In other words, short barrels can often be less picky about what the charge weight is.

If you wanted to regain some velocity due to the gasgun tax, you can drop down to 130 gr. bullets.


[Linked Image]
800 Yard Steel Range
Precision Rifle Instruction
Memberships and Classes Available
Re: 6.5 creedmoor AR10 barrel length [Re: el_cazador713] #5783206 06/10/15 10:46 PM
Joined: Nov 2011
Posts: 3,621
D
DStroud Offline
Extreme Tracker
Offline
Extreme Tracker
D
Joined: Nov 2011
Posts: 3,621
I too went with a JP 22 inch barrel in my AR 10 Creedmoor. In the AR I run the 123gr Scenars at 2880fps using IMR4007SSC powder.


"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."

Jack O'Connor 1963
Re: 6.5 creedmoor AR10 barrel length [Re: J.G.] #5783474 06/11/15 01:29 AM
Joined: Jun 2009
Posts: 4,175
K
Korean Redneck Online Content
Extreme Tracker
Online Content
Extreme Tracker
K
Joined: Jun 2009
Posts: 4,175
Originally Posted By: FiremanJG


If you wanted to regain some velocity due to the gasgun tax, you can drop down to 130 gr. bullets.


"Gas gun tax". Hahaha I like that. I'm totally stealing that saying.


I'm a dude who likes long barrels!
Previous Thread
Index
Next Thread

© 2004-2024 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide
Powered by UBB.threads™ PHP Forum Software 7.7.3