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+--- Thread: Need help on barrel for a rifle project (/showthread.php?tid=25148)
Need help on barrel for a rifle project - Jaeger Heisen - 11-23-2022
https://www.rainierarms.com/rainier-arms-ultramatch-mod2-6-5-grendel-750-gas-block-fully-fluted-barrel-18/
https://sixsigmaarms.com/products.php?d=61#order
Im ditching my pistol project for now until the ATF loses their case on braces vs SBRs. So I need a hunting upper and these 2 barrels seem to get some of the highest reviews. The advantage the raniner has is the rifle length has system, if it really and advantage as those extra 2 inches arnt going really make a difference in shooting a deer under 200 yards.
So. That being said. What is yalls opinion or do you have a better barrel idea?
Need help on barrel for a rifle project - grayfox - 11-23-2022
Rainier is a good barrel as far as I know.
Lilja is a top quality one...
that being said, if six sigma only has the 16" max (they are a reseller for Lilja), you might call him to see if he has the 19" AR19 or the 20" AR740, the lilja web site has the 20" for sale now, buying direct. That's where I got mine from.
Six sigma has a vendor thread on here but he (Rebby) hasn't updated it for a while. he is a nice guy though, bottom line for lilja you have a couple options as to where to buy.
My $0.02 but I think the grendel works a bit better with the rifle length gas. Mid-length bangs up stuff a lot more due to the higher gas pressures at unlock. But there are better experts on here than I am... I pretty much stick with RL gas stuff.
Need help on barrel for a rifle project - VASCAR2 - 11-24-2022
On an 18 6.5 Grendel the rifle length gas system makes a significant difference if your going to use a suppressor. I have an 18 Group Buy Faxon Monster logo barrel and it is perfectly gassed using a supplied carbine buffer and spring with my collapsable stock. Here is some chronograph data I collected using a Magnettospeed chronograph comparing the velocities between 16 & 18 6.5 Grendel. This data is a few years old but the trends in velocity still hold true with current ammo. The 16 barrel was a J&T Distributing (sister Co. to Double Star) and a Brownells 18 rebranded Satern button rifled barrel. For a hunting barrel I dont think you could go wrong with either Lilja or Rainier.
Here is the difference between the 18 barrel compared to the shorter 16 barrel which was slower with every load.
120 grain PPU HP BT
63 FPS difference
110 grain PPU FMJ
60 FPS difference
123 grain A-Max
45 FPS difference
123 grain SST
63 FPS difference
Hand load 123 grain Nosler CC
27 FPS difference
Wolf 100 grain FMJ Steel cased
64 FPS difference
Here are the velocities for factory 123 grain SST we got in our velocity test with the various barrel lengths.
123 Grain SST Hornady
12 2277
16" 2430
18" 2493
20" 2511
24" 2583
Need help on barrel for a rifle project - LRRPF52 - 11-25-2022
For east Texas, I would lean on 16.
There isnt a significant performance and effective range difference between 14.5 16, and 18.
We did a table on barrel length and performance based on the 123gr SST expansion threshold in the Grendel Handbooks that breaks it all down, with a velocity range for each barrel length.
10.5 260yds
14.5 350-400yds
16 400-420yds
18 410-440yds
20 450-490yds
24 500-520yds
Will you be shooting suppressed? If so, I would look at 13.9-14.7 with a pinned and welded brake attack muzzle device for the suppressor to bring it to 16, that way you can have a short, compact fire stick without dealing with unconstitutional NFA horse crap.