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I decided to start my foray into the 6.5 Grendel cartridge. I looked at a variety of options, including building my own, but in the end felt that the value offered and the component selection met my requirements on what was offered by this new small business, Grendelhunter.com. Here are the specs of what I bought, the price on sale was $379.99 for the upper without BCG and charging handle:
16″ Stainless Barrel (barrel is by Satern)
Medium Contour
Mid Length Gas
1-8 Twist 5R
5/8×24 Threaded Muzzle with Thread Protector
12″ Megafins Free Float KeyMod Hand Guard Strike Industries
Forward Assist Strike Industries
Dust Cover Strike Industries
6.5 Grendel II Chamber
I also purchased the optional bolt, BCG, and extended latch chargin handle for another $160:
6.5 Grendel Type II Bolt
6.5 Grendel Bolt Carrier Group
Extended Latch Charging Handle Strike Industries
Here is a quick video look at it:
https://youtu.be/HBWw4Vlrgt0
-dgunnut
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We be watching ... Anxious to get something more hog worthy than 5.56/223.
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Curious about the accuracy of these. I have a buddy that's in the market for a cheap Grendel and saw this company online.
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Any update on how it shoots??
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sportsnut Wrote:Any update on how it shoots??
Unfortunately, I haven't had the ammo or time yet to shoot it yet. There is a possibility I may get out this weekend, otherwise it will be at least another two weeks due to work and other personal commitments. When I do get it out and shoot I will definitely be sharing the results here. Sorry for the delay.
-dgunnut
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I bought a 20"/15" with the BCG and Strike charging handle from Grendelhunter. I am working on the road and won't get to see it for a month or 2, but my son is VERY impressed with my purchase. Everything about dealing with Andy at Grendelhunter was great. I am as happy as I can be being 400 miles away from my new upper.
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I was able to get it out to the range this weekend and put 30 rounds through it. Overall, it shot well. 4 of my 8 groups were 1" or under. A few groups that were larger were likely caused by my cleaning the barrel in between to properly break it in. And/or they could have been shooter error.
Over time I will be getting other ammo to try and getting dies so I can reload for it. I'll keep you guys posted on it as I do more.
Here is a link to the video on the first 30 rounds:
https://youtu.be/CAj3Jy21pZc
-dgunnut
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I'm fixing to buy one of these GrendelHunter uppers but I'm having trouble sorting out the advantage of getting a 18" barrel over a 16". Is there any appreciable increase in accuracy? The velocity increase is minimal by my account.
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Here are some Chrongraph results I got last year, might help you see the difference from the different barrel lengths. All ammo was from the same lot and chronographed on the same day using Magnetospeed chronograph.
Here is a list of the tested ammo by average velocity for each barrel length.
120 Grain HP BT PPU
16" 2392
18" 2455
20" 2480
24" 2559
110 grain FMJ PPU
16" 2510
18" 2570
20" 2614
24" 2683
123 grain A-Max Hornady
16" 2419
18" 2464
20" 2505
24" 2568
123 Grain SST Hornady
16" 2430
18" 2493
20" 2511
24" 2583
Hand Load 123 Grain Nosler CC, 31.0 grains CFE223, CCI 450
16" 2449
18" 2471
20" 2526
24" 2619
100 Grain FMJ Wolf
16" 2507
18" 2571
20" 2615
24" 2695
Hand Load 107 Grain SMK 28.5 IMR8208XBR, CCI 41 Hornady cases.
20" 2658
24" 2729
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03-08-2017, 04:59 PM
(This post was last modified: 03-08-2017, 05:16 PM by Barb Bush.)
macflyboy Wrote:I'm fixing to buy one of these GrendelHunter uppers but I'm having trouble sorting out the advantage of getting a 18" barrel over a 16". Is there any appreciable increase in accuracy?
Yep, this is the question I ask. What about accuracy?
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Barrel length doesn't directly affect accuracy. The higher velocity gained from a longer barrel will result in less drop and wind drift in the bullet's trajectory at distance, but a 2" length difference will probably have a negligible effect on your accuracy results.
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Drillboss Wrote:Barrel length doesn't directly affect accuracy. The higher velocity gained from a longer barrel will result in less drop and wind drift in the bullet's trajectory at distance, but a 2" length difference will probably have a negligible effect on your accuracy results.
Understood. Thank you very much.
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A shorter barrel of the same profile/diameter will have more stiffness, resulting in less whip, but it also narrows down the accuracy nodes for Optimal Barrel Time/longitudinal shock wave.
The 6mm PPC guys did a lot of testing in a large warehouse in Texas back in the day, with a huge bench made from concrete or steel, and found that 21.75" was the optimal barrel length for accuracy with that cartridge for some reason.
NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
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Barb Bush Wrote:Understood. Thank you very much.
Longer barrels are only more accurate if your using open sights. Then a longer sight radius means more accuracy. Actually many argue a shorter barrel tends to be more accurate when using a optics.
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VASCAR2 Wrote:Here are some Chrongraph results I got last year, might help you see the difference from the different barrel lengths. All ammo was from the same lot and chronographed on the same day using Magnetospeed chronograph.
Here is a list of the tested ammo by average velocity for each barrel length.
120 Grain HP BT PPU
16" 2392
18" 2455
20" 2480
24" 2559
110 grain FMJ PPU
16" 2510
18" 2570
20" 2614
24" 2683
123 grain A-Max Hornady
16" 2419
18" 2464
20" 2505
24" 2568
123 Grain SST Hornady
16" 2430
18" 2493
20" 2511
24" 2583
Hand Load 123 Grain Nosler CC, 31.0 grains CFE223, CCI 450
16" 2449
18" 2471
20" 2526
24" 2619
100 Grain FMJ Wolf
16" 2507
18" 2571
20" 2615
24" 2695
Hand Load 107 Grain SMK 28.5 IMR8208XBR, CCI 41 Hornady cases.
20" 2658
24" 2729
From your Post looks like there is a bigger difference between 16" and 18" than 18 to 20. Makes sense since the shorter you go you would expect the fps loss per inch to increase. Glad I went with the 18" over 16" or 20"
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Not trying to hijack the conversation but the OP is asking for accuracy, not precision. Accuracy has nothing to do with the barrel characteristics. It is a function of how are the sights set, either iron or glass doesn't matter. Accurate means that the weapon is statistically hitting the bullseye.
Now precision has everything to do with the barrel, the bench, the wind the trigger.....everything. Precise means that statistically there is very little deviation between shots, in other words....tight groups.
Flame me or whatever, but please use the correct terms.
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Steamburn Wrote:Not trying to hijack the conversation but the OP is asking for accuracy, not precision. Accuracy has nothing to do with the barrel characteristics. It is a function of how are the sights set, either iron or glass doesn't matter. Accurate means that the weapon is statistically hitting the bullseye.
Now precision has everything to do with the barrel, the bench, the wind the trigger.....everything. Precise means that statistically there is very little deviation between shots, in other words....tight groups.
Flame me or whatever, but please use the correct terms.
You are absolutely correct. I assumed that's what he was asking, knowing the difference. Well, now that you mentioned it, what are your thoughts?
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