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AR10s - 18" or 20" Barrel
- Thread starter firecadet613
- Start date
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Where are you finding 20 inchers!? Give me one!
Just like with AR-15s and .223/5.56, I personally like longer. Some think the bonus velocity is negligible. My SA is a 16 inch, if I had a chrono we'd probably see a difference in velocity.
Just like with AR-15s and .223/5.56, I personally like longer. Some think the bonus velocity is negligible. My SA is a 16 inch, if I had a chrono we'd probably see a difference in velocity.
.308 Win Barrel Cut-Down Test: Velocity vs. Barrel Length « Daily Bulletin
With barrels, one wonders Can a little more length provide a meaningful velocity gain? To answer that question, Rifleshooter.com performed an interesting test, cutting...
"Summary of Findings: The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. By ammo type, the average loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP)."
Great link, thank you!.308 Win Barrel Cut-Down Test: Velocity vs. Barrel Length « Daily Bulletin
With barrels, one wonders Can a little more length provide a meaningful velocity gain? To answer that question, Rifleshooter.com performed an interesting test, cutting...bulletin.accurateshooter.com
"Summary of Findings: The average velocity loss per inch, for all four ammo types combined, was 22.7 FPS. By ammo type, the average loss per inch was: 24.6 (Win 147 FMJ), 22.8 (IMI 150 FMJ), 20.9 (Fed GMM 168gr), and 22.5 (Win 180PP)."
I had a 13.9 p/w 308
I'd do it again. But probably 14.5 p/w instead for a slightly better dwell time.
You don't 'need' to go past 16" - I know a lot of people with 16" 308s and they're more than capable. Just look up some ballistic gel tests on youtube.
It's like saying the 10.5 AR in 5.56 is useless compared to 20" ARs. Lots of dead guys will disagree.
I'd do it again. But probably 14.5 p/w instead for a slightly better dwell time.
You don't 'need' to go past 16" - I know a lot of people with 16" 308s and they're more than capable. Just look up some ballistic gel tests on youtube.
It's like saying the 10.5 AR in 5.56 is useless compared to 20" ARs. Lots of dead guys will disagree.
Knights is doing a 14.5 6.5cm I believe and I think LMT already offers one.
A lot of people playing with 14.5cm right now and it makes a lot of sense.
I still refuse to buy into the modern times with 6.5 - even though I'm not an old timer, I just like the fact that 308 is over 3x as old as me and that there's a LOT of it sitting around in case society stops tomorrow. So I'm stuck with 308 for the foreseeable future.
But 14.5cm is the way to go on this if OP is willing.
308 is old and proven... not saying 6.5 isn't good, but 308 is where my interests lie right now.
Great feedback all!
Who made that receiver set/handguard? That's one prettttty rifle you have there sir.Yep, I think LMT's is even a 13". I like 308 that's what my ar10 is chambered in, but I am considering swapping to a 13.7-14.5" 6.5 after this hoard of 308 ammo is gone.
18" 308
It makes me super excited to get my FDE lmt mrp back from cerakote.
Are you suggesting a one size fits all for calibers? There's no difference in requirements for PRS bench shooting vs 3 gun course running?
Or for carbines meant for people who will be in vehicles and then going into something like a house?
Everyone should use 20-24" barrels for 308 and 20" barrels for 5.56 because that's what the caliber was built on - from long range bench shooting to backpack truck guns?
12 gauge shotguns should all be 30" with chokes as well, even for the breaching shotguns the army or marines use.
I totally agree with you if this is your reasoning. Even 1" short from the intended length is an atrocity and should be illegal.
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