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+--- Thread: The rush to short barrel Grendels (/showthread.php?tid=14633)
The rush to short barrel Grendels - LRRPF52 - 12-11-2019
I just got a 10.5" Grendel Criterion pipe from Precision Firearms.
Once I get through all the other work I'm doing right now and get it together, I'll go see what kind of velocities I will get with several factory loads, and take it out to distance just for fun.
Think about that though for a minute. More retained energy/impact speed at 150yds and out from half the barrel length shooting the exact same bullet weight compared to a 20" SKS.
And people still wonder why so many are buying short barreled Grendel uppers, barrels, pistols, etc.
Also, the recoil and muzzle climb with my AKs feels like 1920s cog machinery banging around compared to Grendel, even in the much smaller AR15 pistols. You can also still have a smaller, lighter package with a suppressed 12" than an unsuppressed AK.
Here's a graph I made comparing my 16.3" Maadi AKM with optimistic mv vs the 12" Grendel.
![[Image: 282b205f-8dd2-4061-8728-dde5e4ab4c30_zpsuqnm5t2u.jpg]](https://i1085.photobucket.com/albums/j422/LRRPF52/65%20Grendel%20Reloading/282b205f-8dd2-4061-8728-dde5e4ab4c30_zpsuqnm5t2u.jpg)
The rush to short barrel Grendels - CaptnC - 12-11-2019
LRRP,
Not sure if you missed parts of my post or what happened. But I'm not shooting a SKS...I own several AR-15 rifles chambered in 7.62x39...2 that are 16" and one that's 20".
Now for the ammo...not Russian junk...my personal hand loads with Barnes TAC-X 123 with a modist. 270 G1
As you can see in the below photo, the magnetospeed is reading 2470fps...the pictured tatarget was shot at 100yds with my old NV scope which is only 3x. The 7.62x39 barrel is a 16" SS from BCA. If you want to use a 20" barrel...my 20" 7.62x39 AR-15 has a bit fast MV than the 16" pictured below.
So please stay with the facts...
A5B seems to be off his meds again...he kind of flippn' out!
To be honest LRRP not not saying a 7.62x39 AR-15 is better than the 6.5 Grendel (hell...I own 4 of them) but for the average shot on a WT deer in 90% of their normal range they are both just as dead at the end of the day...just because you feel the need to shave off 4" of barrel doesn't make it better.
The rush to short barrel Grendels - CaptnC - 12-11-2019
PrecisionFirearms Wrote:I have a bunch of these if anyone is interested
Oh...just an FYI...my earlier comments where made before I read all the posts. I was by no means try it insult you.
I guarantee you, if I was in the barrel business, I would be cutting 6" 6.5 Grendel barrels if people would buy them. After all business is business!
The rush to short barrel Grendels - A5BLASTER - 12-11-2019
CaptnC Wrote:LRRP,
Not sure if you missed parts of my post or what happened. But I'm not shooting a SKS...I own several AR-15 rifles chambered in 7.62x39...2 that are 16" and one that's 20".
Now for the ammo...not Russian junk...my personal hand loads with Barnes TAC-X 123 with a modist. 270 G1
As you can see in the below photo, the magnetospeed is reading 2470fps...the pictured tatarget was shot at 100yds with my old NV scope which is only 3x. The 7.62x39 barrel is a 16" SS from BCA. If you want to use a 20" barrel...my 20" 7.62x39 AR-15 has a bit fast MV than the 16" pictured below.
So please stay with the facts...
A5B seems to be off his meds again...he kind of flippn' out!
To be honest LRRP not not saying a 7.62x39 AR-15 is better than the 6.5 Grendel (hell...I own 4 of them) but for the average shot on a WT deer in 90% of their normal range they are both just as dead at the end of the day...just because you feel the need to shave off 4" of barrel doesn't make it better.
Lmao. More drivel lmao. Why must you do this too every short barrel thread?
You sure it's me that's off my meds?
The rush to short barrel Grendels - LRRPF52 - 12-11-2019
CaptnC Wrote:LRRP,
Not sure if you missed parts of my post or what happened. But I'm not shooting a SKS...I own several AR-15 rifles chambered in 7.62x39...2 that are 16" and one that's 20".
Now for the ammo...not Russian junk...my personal hand loads with Barnes TAC-X 123 with a modist. 270 G1
As you can see in the below photo, the magnetospeed is reading 2470fps...the pictured tatarget was shot at 100yds with my old NV scope which is only 3x. The 7.62x39 barrel is a 16" SS from BCA. If you want to use a 20" barrel...my 20" 7.62x39 AR-15 has a bit fast MV than the 16" pictured below.
So please stay with the facts...
A5B seems to be off his meds again...he kind of flippn' out!
To be honest LRRP not not saying a 7.62x39 AR-15 is better than the 6.5 Grendel (hell...I own 4 of them) but for the average shot on a WT deer in 90% of their normal range they are both just as dead at the end of the day...just because you feel the need to shave off 4" of barrel doesn't make it better.
I read every detail of your posts. Not sure where the ball is being dropped. An AR15 chambered in 7.62x39 is never going to be able to handle the loads that an SKS or AK will if you hand load, unless you're shooting the CMMG Mutant.
Even if I hand-load my 20" SKS with that Barnes TAC-X, it will never be able to keep up with the downrange performance of even a short 10.5" Grendel shooting factory ammo. The SKS will of course be faster at the muzzle, but because of the extremely poor BCs of the .310" bullets in that weight class, they lose energy rapidly due to their fat/short/flat-base form factor, even within the short distances.
They both will kill just fine, but you pay a rifle length/weight/bulk penalty that is always there when you are not shooting, while getting less performance and effective range.
The rush to short barrel Grendels - LRRPF52 - 12-11-2019
I just looked up Barnes load data for the 123gr TSX-BT .310" bullet for 16.5" AK.
You're averaging over 200-260fps faster than all of their max loads in a much stronger action.
I then checked Hodgdon's load data for 7.62x39 with CFE BLK in a pressure test breach with 24" barrel, then ran their max load through a 16" barrel model. Again, you're 210fps faster than you should be with the listed max load by Hodgdon's.
What type of 7.62x39 AR bolt are you using? You will crack it around the cam pin hole or shear the 2 lugs adjacent to the extractor pocket with that load if you continue to shoot it. You're exceeding the CIP chamber pressure specs of 7.62x39 by a substantial margin.
https://www.barnesbullets.com/wp-content/uploads/2016/03/7.62x39-16.5in-Barrel.pdf