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16” 6.5 creedmoor?
- Thread starter steve101610
- Start date
I'm talking about those two loads he cited as normal .308 loads, not the 80ksi loads. He hints that they are book loads or a half grain under, but he's getting 150fps - 200fps more than most folks and won't just come out and say what the actual load is.
2000 MRI can’t read it, since you have the hand writing skills of a 3 year old…
50.0 of what?
Any of y'all with these shorter length barrels & gas systems having or had functioning issues ie cycling, ejecting, feeding etc?
I have built two of these now - one in 308 and one in 6.5.
Both run 16" barrels.
308 is Wilson Combat Recon barrel, intermediate gas.
6.5 is custom spec X-Caliber, mid length gas.
Have broken 2 ejectors on the 308 in less than 200 rounds, shooting mostly factory 155 Norma.
6.5 is having ejection issues and showing signs of overgas when the block is almost fully closed.
Running sprinco Orange and KAK heavy carbine buffer.
I have built two of these now - one in 308 and one in 6.5.
Both run 16" barrels.
308 is Wilson Combat Recon barrel, intermediate gas.
6.5 is custom spec X-Caliber, mid length gas.
Have broken 2 ejectors on the 308 in less than 200 rounds, shooting mostly factory 155 Norma.
6.5 is having ejection issues and showing signs of overgas when the block is almost fully closed.
Running sprinco Orange and KAK heavy carbine buffer.
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I had a 16" 308 mid gas that would show pressure signs unless loaded under book minimum, regardless of buffer/carrier weight or gas setting. Brass would have extractor pulls, ejector swipes, and loose pockets after two firings. The issue was excessive dwell; I cut 3.5" off of the barrel and now it runs book max loads without any issues.
AR10 mid gas can be problematic.
The 308 with hybrid cases runs higherNow that's funny right there. 6.5 creeds not keeping up with the 308s ballistically.let me see here which one can run the highest BC bullet fastest...
BC bullets faster than the 6.5 CM with brass cases... fact.
200 SMK to 230 gr Atips are much higher BC than anything available in 6.5.
It's the same hybrid case as the 277 Fury hybrid case which runs similar velocity as the 270 WSM in a necked down hybrid 308 case.
The 270 WSM, and the 277 hybrid have more velocity than the 6.5 CM with high BC bullets.
So one can apply hybrid cases to the 6.5 CM to bring up it's ballistic potential.
The hybrid cases in the creed are definitely fun to play with. .308 hybrid cases are a lot easier, no neck turning, I have some worked up to use for normal high end .308 loads because my mid gas SFAR (like all mid-gas .308s I've had in the past) unlocks early and tears up cases at relatively low charge weights. A longer gas system is the real fix, but I like the SFAR enough that Hybrid cases are worth a try, especially since American Reloading has them for a good deal so often.
I'd expect a mid-gas 6.5 to be rough any way you cut it, but are you using AGBs on these uppers? (Edit, nevermind, missed the part about the gas block being nearly closed on the 6.5)
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Very Interesting read... Thank You to all !!
BTW... IMHO Faxon barrels are like McDonald's Cheeseburgers.
A Cheeseburger in name, ingredients, pretty pics/ specs... but not really a great cheeseburger.
BTW... IMHO Faxon barrels are like McDonald's Cheeseburgers.
A Cheeseburger in name, ingredients, pretty pics/ specs... but not really a great cheeseburger.
The easiest is the 277 Fury.
But any caliber based on the 308 case can be improved in velocity without going to the full 80,000 psi.
Primer pockets stay tight.
I run 358 Win, 308 Win, 6.5CM, 8.6 Blkout, all with hybrid cases.
So you can improve your 6.5 CM to complete with the 6.5 PRC with hybrid cases.
This way the 8.6 Blk keeps up with the 338 Federal in supers and able to go subsonic much easier than the 338 Federal...just get the 6.5 twist or at most a 5 twist.
Stay away from the limiting 3 twist, especially in Faxon, a new report says they still haven't learned to rifle the 3 twist consistently with out torn, galled, pitted, and reamer marked rifling...just like their early ones.
Hybrid cases from 264, 308, 338, 358, and 375...and steps in making 8.6 Blkout.
I modify them by the hundreds.
Test 308 high performance loads.
And how I neck turn, but into the shoulder is good enough with hand tools.
Pursue it or not it's there... and ya don't have to go petal to the metal but leave a safety margin, to improve any 308 head based cartridges.
With the 8 twist one can even shoot 250 Atips at reasonable velocities in 308 Win if set up correctly.
Some powders burn more efficiently at higher pressures, with low S/Ds. Had some excellent numbers with hybrid cases.
Put the effort in get better performance out, and it's adjustable.
It's not for everybody, but some are doing it, and getting positive results.
I've been at it since the hybrid cases first came out.
But you have to be careful and pay attention, like any reloading endevor.
But any caliber based on the 308 case can be improved in velocity without going to the full 80,000 psi.
Primer pockets stay tight.
I run 358 Win, 308 Win, 6.5CM, 8.6 Blkout, all with hybrid cases.
So you can improve your 6.5 CM to complete with the 6.5 PRC with hybrid cases.
This way the 8.6 Blk keeps up with the 338 Federal in supers and able to go subsonic much easier than the 338 Federal...just get the 6.5 twist or at most a 5 twist.
Stay away from the limiting 3 twist, especially in Faxon, a new report says they still haven't learned to rifle the 3 twist consistently with out torn, galled, pitted, and reamer marked rifling...just like their early ones.
Hybrid cases from 264, 308, 338, 358, and 375...and steps in making 8.6 Blkout.
I modify them by the hundreds.
Test 308 high performance loads.
And how I neck turn, but into the shoulder is good enough with hand tools.
Pursue it or not it's there... and ya don't have to go petal to the metal but leave a safety margin, to improve any 308 head based cartridges.
With the 8 twist one can even shoot 250 Atips at reasonable velocities in 308 Win if set up correctly.
Some powders burn more efficiently at higher pressures, with low S/Ds. Had some excellent numbers with hybrid cases.
Put the effort in get better performance out, and it's adjustable.
It's not for everybody, but some are doing it, and getting positive results.
I've been at it since the hybrid cases first came out.
But you have to be careful and pay attention, like any reloading endevor.
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Interesting. Even with the intermediate length (only an extra 1-1.5" gas length) it is still fairly harsh.
Seems like I'm having the same problem with the 6.5 because that is the mid length unfortunately.
Regardless of bolt manufacturer, the roll pins to retain the ejector and spring are pretty much the same. Two roll pins have been sheared clean on the 308.
I have an extra set of pins on the way and I am upgrading to a JP high pressure bolt and will see if anything changes.
A single pass though a .308 die is about the same effort as a single pass through a 7mm-08 die. The 6.5 is more work because I run the .277 cases through a .308 die with the expander removed (helps move the shoulder back some and keep from getting wrinkles), then rough trim, then through a Creed die then final trim and neck turn. Either should be annealed afterwards of course.
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Zero issues with my 16” 6.5 build in ~500 rounds. Criterion barrel, rifle length gas system, JP full mass BCG
I personally wouldn’t run a 16” 6.5 CM with a mid-length gas system.
The best source has been American Reloading, free shipping, and many times on sale.
I have purchased several thousand.
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I run an intermediate gas system in a 16" 308 with no issues. It's has a titanium bolt carrier, and magnesium upper, carbon fiber handguard, titanium muzzle brake, adjustable gas block.
It's a 6 lb 3 oz AR 10 308 16" barrel...
And running 155 grs at 2875, with the highest velocity at 2922 fps and 168 Eldm running at 2756 fps, 208 gr Eldm running at 2442 fps.
This is the AR 10 with the first load of 155 gr bullets out of the 16" barrel, these are standard brass cases many are Lake City.
It's a 6 lb 3 oz AR 10 308 16" barrel...
And running 155 grs at 2875, with the highest velocity at 2922 fps and 168 Eldm running at 2756 fps, 208 gr Eldm running at 2442 fps.
This is the AR 10 with the first load of 155 gr bullets out of the 16" barrel, these are standard brass cases many are Lake City.
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I am starting to realize this now unfortunately. I didn't think rifle length gas would be ideal with the 16" so the only other option was the mid length.
That's interesting. What buffer system?
It is said that 308Win should/can have the same gas length as 223 but it is plainly untrue. "Midlength" is an AR15 gas length and shorter than the Armalite 308Win carbine length gas system. Some 308 work with AR15 midlength and some don't, it's luck of the draw. 16" rifle length 308 Win works great and should be the defacto standard.
