16” 6.5 Creedmoor barrel worth it?

[Pappabear]

Which 16 inch barrel matters a great deal too. My DD Delta 5 bolt gun has a very fast (tight chamber?) barrel for a 20inch gun. It performs like my 24 inch bolt gun.

I bought an MWS 20inch SS barrel to inch out every possible bit of velocity vs my 16 inch barrel and I gained a measly 50 to 75 FPS. Another note, our other shooting buddy often quoted here has an 18inch MWS barrel that he makes consistent hits at 1,360 with 175 TMK's flying at 2630 FPS and its his favorite gun. And he has many many many guns like most of us.

So you can def run 6.5cm out of a 16 inch gassy with success, but dont 100% compare ones guys gun to your build. Just build shoot and learn, that is all you can do.

PB

[MadAngler1]

So if one compares 6.5 Creedmoor vs 7.62 NATO in a 16” gas gun, what are the differences in:

1. Actual ballistic performance

2. Barrel life

3. Overall costs, namely per round

I can see 6.5 Creedmoor on 20-26” bolt and gas guns any day of the week over 7.62x51. For 16”, I question the advantage until I see better data. 6.5 Creedmoor is flatter shooting than 7.62x51 out of a 16” barrel but at what price?

[pointblank4445]

So if one compares 6.5 Creedmoor vs 7.62 NATO in a 16” gas gun, what are the differences in:

1. Actual ballistic performance

2. Barrel life

3. Overall costs, namely per round

I can see 6.5 Creedmoor on 20-26” bolt and gas guns any day of the week over 7.62x51. For 16”, I question the advantage until I see better data. 6.5 Creedmoor is flatter shooting than 7.62x51 out of a 16” barrel but at what price?

So in running the numbers today of various 308 projectiles of varying weight and BC vs 6.5CM in 130-140gr projo's in the 2300-2500 range and here's basically the gyst of what i'm seeing in terms of external ballistic performance:
Roughly 0.5 mil less hold at 1000y (with 10mph full value/90degree wind) in favor of 6.5CM (calculated 3.0 vs 3.5 mil hold)
Roughly similar ranges achieved when approaching trans-sonic velocities...no more than 70ish yards difference at approaching 1300fps

The point being this:
While 6.5 CM holds the external ballistic advantage...however slightly at these speeds, is it worth it for:
#2 ) barrel life
#3 ) ammo costs
#4 ) likely more costs on terminal effect due to the 6.5 being more of the fish-out-of-water at those speeds noted above in relation to expansion threshold and inherently lower energy numbers


If I weren't responsible for my gun (barrel), the ammo or the morality of terminal effect, 6.5CM it up and bring on the MRGG!!!


I gotta be honest fellas...I'm a fan of 6.5mm going back to before the existence of 6.5CM...

And even considering a lighter boltgun at 18ish inches, that even has me on the fence and leaning 308 given logistics.

[markm]

While 6.5 CM holds the external ballistic advantage...however slightly at these speeds, is it worth it for:
#2 ) barrel life

This will be interesting for us. I mean... we shoot 6.5cm like some guys shoot 5.56mm. Ammo cans with loose rounds on the bench. It will be interesting to see if we can wear out a barrel.

I wish we kept a better round count log.

[opngrnd]

This will be interesting for us. I mean... we shoot 6.5cm like some guys shoot 5.56mm. Ammo cans with loose rounds on the bench. It will be interesting to see if we can wear out a barrel.

I wish we kept a better round count log.

I consistently hear that accuracy degrades at 2500 rounds in 6.5 creedmoor. Gonna be interesting to see if it's true.

[pointblank4445]

This will be interesting for us. I mean... we shoot 6.5cm like some guys shoot 5.56mm. Ammo cans with loose rounds on the bench. It will be interesting to see if we can wear out a barrel.

I wish we kept a better round count log.

I consistently hear that accuracy degrades at 2500 rounds in 6.5 creedmoor. Gonna be interesting to see if it's true.

They'll go when they go. Had 308's go anywhere between 5k and 10k in a stainless barrel. With what's available and the cost, it's going to take a minute and several grand to smoke a 6.5 barrel unless you're tryin' to

[richiecotite]

I like the 16” AR308 I put together; using the same WC barrel OP mentioned, WC rail and aero receivers it weighs less than a 8 lbs. FWIW with a 140 gr ELDM and 41.5 gr of H4150, averaging 2581.


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[Hammer_Man]

With today’s political climate I decided to start my journey by ordering a Stag10 blem lower in FDE, and a matching FDE upper. I’m still leaning toward a 16” barrel, but may go 18” depending on pricing and availability.

[turnburglar]

With today’s political climate I decided to start my journey by ordering a Stag10 blem lower in FDE, and a matching FDE upper. I’m still leaning toward a 16” barrel, but may go 18” depending on pricing and availability.

Get an 18" rifle gas. 6.5 CM is a very gassy round and the extended gas system is noticeable. I ONLY went with a 16" because I am waiting on a can in jail and wanted a shorter OAL.

To all the dudes who think a short 6.5 CM isn't worth it compared to a 308.... YOU are behind the curve. Sorry, but I dont spend a ton of time reading and extrapolating internet posts to figure out what gun is best. I go out and shoot. I have noticed a trend in large frame gas gun shooters all migrating away from 308. I even had a 308 for a little bit. So glad I shoot a 6.5 now. Sorry you just dont 'get it'.

[markm]

Get an 18" rifle gas. 6.5 CM is a very gassy round and the extended gas system is noticeable.

Are you seeing that yours is already gassy BEFORE adding the can? Or have you shot other set ups?

Neither of the 2 gas guns (Colt and LMT) we shoot seem very gassy, but they're definitely not 16" barrels. (both are suppressed)