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Thoughts on barrel length for 6.5 Grendel AR...18” or 20”? Login/Join 
PopeDaddy
Picture of x0225095
posted
As the title says...

General purpose rifle for Target/Range shooting and Hunting (Whitetail & Hogs)

Can’t decide between 18” or 20”.

Leaning towards 20”...

Any forum experiences out there ?


0:01
 
Posts: 3414 | Location: ALABAMA | Registered: January 05, 2008Reply With QuoteReport This Post
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Muzzle velocity will likely be some 40 to 70 fps from the longer barrel, depending on load, for similar barrels.

The 20" barrel will weight a little more, with the additional weight depending on brand and barrel profile.

For a target shooting, where you generally don't move around much, a longer barrel improves flight ballistics.

For hunting, a lighter barrel is easier to carry.
 
Posts: 6233 | Location: Colorado | Registered: January 26, 2008Reply With QuoteReport This Post
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Picture of ed308
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For target, 20" barrel would be my choice and what I have for my 6.5 Grendel. But for hunting, I grab one of my 6.8 SPC with a 16" or shorter barrel. When hunting, I like light weight and a short barrel. Unlike the Grendel, the 6.8 doesn't give up much when you go short on the barrel.
 
Posts: 594 | Location: DFW Area | Registered: January 12, 2015Reply With QuoteReport This Post
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quote:
Originally posted by ed308:
Unlike the Grendel, the 6.8 doesn't give up much when you go short on the barrel.

Fluid dynamics is behind the physics of how much a bullet gains/loses velocity as a barrel length increase/decreases. There isn't much difference in powder capacity for the two cartridges, nor is there all that much difference in bore size.

Sure, the 6.8 is a slightly larger bore, therefore its MV is slightly less affected by barrel length. But it's splitting hairs -- it's not comparable to the MV & energy differences between, say, a 223 Remy and 300 blk, for SBR and rifle-length barrels.
 
Posts: 6233 | Location: Colorado | Registered: January 26, 2008Reply With QuoteReport This Post
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Suppressing? Get 18. If not, then get 20.
 
Posts: 1307 | Location: County 18, OH | Registered: April 11, 2007Reply With QuoteReport This Post
PopeDaddy
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Thanks for all the input fellas.

I got the Atheris 20”.


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Posts: 3414 | Location: ALABAMA | Registered: January 05, 2008Reply With QuoteReport This Post
...and now here's Al
with the Weather.
Picture of guardianangel762
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What ranges are you using it?

I have a 22" for open areas and a 12" for my brush gun.


___________________________________________________
But then of course I might be a 13 year old girl who reads alot of gun magazines, so feel free to disregard anything I post.
 
Posts: 9005 | Location: Lake Stevens, WA | Registered: March 20, 2005Reply With QuoteReport This Post
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